//Global variables are marked as v_*
//Local variables are marked as lv_*
//Axes variables are named as x and y
//Functions are marked as f_*
//Files are marked as file_*
//File locations are marked as c_*
//Structures are marked as s_*
#include<conio.h>
#include<string.h>
#include<stdio.h>
#include<ctype.h>
#define v_length 17
void f_loginapproved(void);    //Function prototypes.
void f_logout(void);
void f_read_pass(void);
void f_change_password(void);
void f_write_pass(char[v_length]);
void f_login_border(void);
void f_main_border(void);
void f_main_options(void);
void f_student_options(void);
char f_encrypt_password(char[v_length]);
void f_add_student(void);
void f_search_student(void);
void f_remove_student(void);
void f_dialog_border(void);
char f_clear_variable(char[]);
char v_uname[v_length]="Admin001";  //Default username and password global variables.
char v_passw[v_length]="password";
char c_filename[20]="login.dat"; //Password file for login.
char c_student_rec[20]="stud.dat";
char c_staff_rec[20]="staff.dat";
char v_garbage[20];
FILE *file_password;
FILE *file_student_rec;
FILE *file_staff_rec;
struct sgrades
{
  int History;
  int Geography;
  int Math;
  int English;
  int Humanities;
  int Science;
  int Art;
  int PE;
};
struct student_rec
{
  int id;
  char fname[15];
  char lname[15];
  char address[50];
  int age;
  char gender;
  char phone[15];
  sgrades s_grades;
};
struct staff_rec
{
  char fname[15];
  char lname[15];
  char address[50];
  int age;
  int id;
  long int phone;
  char gender;
  double monthly_pay;
};


void main(void)    //Main function used as login screen.
{
 clrscr();
 f_read_pass();            //Moves to function to update password variable.
 char lv_name[v_length]="";         //Sets local input variables for login.
 char lv_pass[v_length]="";
 int lv_valid;             //Sets variable to count attempts in loop.
 int lv_attempt=0;
 do{
  f_login_border();        //Draws login border.
  gotoxy(32,25);
  printf("Username:");     //Displays username and password labels.
  gotoxy(32,27);
  printf("Password:");
  gotoxy(43,25);
  gets(lv_name);           //Gets input of username and password from user.
  gotoxy(43,27);
  gets(lv_pass);
  f_encrypt_password(lv_pass);
  if(strcmp(lv_name,v_uname)!=0 || strcmp(lv_pass,v_passw)!=0)    //Compares inputted password and username with file-saved password and default username.
   {
    lv_attempt++;
    lv_valid=0;
    gotoxy(27,30);
    printf("Incorrect username or password"); //Error message if wrong input.
    getch();
    clrscr();
   }
  else                   //If input is correct local variable valid is 1.
    lv_valid=1;
  }while(!lv_valid && lv_attempt<3);  //Loops until more than 3 tries or valid is 1.
  if(lv_attempt>2 && !lv_valid)
   {
    gotoxy(18,30);
    printf("Sorry, maximum of three(3) attempts reached");  //Error message after 3 wrong tries.
    getch();
   }
  else
   {
    f_loginapproved();   //Main menu function to display all options.
   }
}



void f_loginapproved(void) //LoginApproved function to enter menu after login.
{
 int lv_mainmenu=0;    //Sets variable for user input.
 int lv_choice=0;
 int lv_counter=1;
 do{
  clrscr();
  gotoxy(37,14);
  printf("Main Menu\n");
  for(lv_counter=1;lv_counter<=5;lv_counter++)
  {
   printf("\n\n\t\t%i.",lv_counter);
  }
  gotoxy(19,17);
  printf("Main Options");       //1.
  gotoxy(19,19);
  printf("Student Options");    //2.
  gotoxy(19,21);
  printf("Staff Options");      //3.
  gotoxy(19,23);
  printf("");			//4.
  gotoxy(19,25);
  printf("Exit");               //5.
  gotoxy(17,29);
  printf("Input:");
  f_main_border();      //Draws main border around main menu.
  gotoxy(23,29);
  scanf("%i",&lv_mainmenu);
  v_garbage=getchar();
  switch(lv_mainmenu)   //Checks user input with possible answers.
  {
   case 1:              //Main Options.
   {
    f_main_options();
    break;
   }
   case 2:              //Student Options.
   {
    f_student_options();
    break;
   }
   case 3:              //Not specified.
   {
    printf("Sorry, this option is currently unavailable");
    getch();
    lv_choice=0;
    break;
   }
   case 4:              //Not specified.
   {
    printf("Sorry, this option is currently unavailable");
    getch();
    lv_choice=0;
    break;
   }
   case 5:              //Logout.
   {
    f_logout();
    lv_choice=1;
    break;
   }
   default:             //If any other character is inputted.
   {
    f_dialog_border();
    gotoxy(19,25);
    printf("Invalid entry. Please use numeric values only.");
    getch();
    lv_choice=0;
    break;
   }
  }
 }while(lv_choice==0);   //End of while loop.
}




void f_read_pass(void)   //Read password function to read saved password file.
{
 if((file_password=fopen(c_filename,"rb+"))==NULL)    //Opens password file and checks if empty.
 {
  printf("No password, default=password");
  getch();
  f_encrypt_password(v_passw);    //Encrypts default password.
  clrscr();
 }
 else
  fscanf(file_password,"%s",v_passw); //Reads password and updates variable.
 fclose(file_password);
}




void f_change_password(void)  //Password function to edit password variables.
{
 char lv_pass[v_length]="";
 clrscr();
 f_main_border();
 gotoxy(34,14);
 printf("Change Password");
 gotoxy(15,16);
 printf("Use this option to change your login password. Make sure");
 gotoxy(17,17);
 printf("it is a password that you remember. Your password is");
 gotoxy(19,18);
 printf("encrypted and safely stored until next login.");
 gotoxy(15,23);
 printf("Enter current password: ");  //Current password test before edit.
 gets(lv_pass);
 f_encrypt_password(lv_pass);
 if(strcmp(lv_pass,v_passw)!=0)   //Asks for current password before prompting for new password.
 {
  f_dialog_border();
  printf("Wrong current password entered. The password has not been");
  gotoxy(14,26);
  printf("changed. Press any key to return to Main Options menu...");    //Error message, does not change password and returns to main menu.
  getch();
 }
 else
 {
  gotoxy(15,28);
  printf("Enter new password [17 characters max]: ");   //Request new password.
  f_clear_variable(lv_pass);   //Empties lv_pass array to be used.
  gets(lv_pass);
  v_garbage=getchar();
  f_write_pass(lv_pass);      //Sends lv_pass array to function as argument.
  f_dialog_border();
  gotoxy(29,25);
  printf("Password has been changed.");
  getch();
 }
}




void f_write_pass(char lv_npass[])     //Password writing function to edit password.
{
 f_encrypt_password(lv_npass);   //Sends lv_pass to be encrypted before continue.
 strncpy(v_passw,lv_npass,v_length);   //Updates global variable with new password.
 file_password=fopen(c_filename,"wb+"); //Erases old password file with blank.
 fprintf(file_password,"%s",v_passw);  //Saves new password in blank file.
 fclose(file_password);
}




void f_logout(void)        //Logout function to exit program at main menu.
{
 char lv_cancel;
 f_dialog_border();
 gotoxy(22,25);
 printf("Logging out. Press any key to exit program..."); //Displays logout message.
 getch();
}





void f_main_options(void)   //Main options funtion to personalise menu.
{
 int lv_options=0;
 int lv_choice=0;
 int lv_counter=1;
 do{
  clrscr();
  gotoxy(35,14);
  printf("Main Options\n");                 //Title of menu.
  for(lv_counter=1;lv_counter<=5;lv_counter++)    //Loop lays out numbers for menu.
  {
   printf("\n\n\t\t%i.",lv_counter);
  }
  gotoxy(19,17);
  printf("Change Password");      //1.
  gotoxy(19,25);
  printf("Return to Main Menu");  //5.
  gotoxy(17,29);
  printf("Input:");
  f_main_border();       //Draws main border around labels.
  gotoxy(23,29);
  scanf("%i",&lv_options);    //Gets user input.
  v_garbage=getchar();
  switch(lv_options)
  {
   case 1:                    //Change Password.
    {
     f_change_password();
     lv_choice=0;
     break;
    }
   case 2:                    //Not Specified.
    {
     f_dialog_border();
     printf("Sorry, this option is currently unavailable");
     getch();
     lv_choice=0;
     break;
    }
   case 3:                    //Not Specified.
    {
     f_dialog_border();
     printf("Sorry, this option is currently unavailable");
     getch();
     lv_choice=0;
     break;
    }
   case 4:                    //Not Specified.
    {
     f_dialog_border();
     printf("Sorry, this option is currently unavailable");
     getch();
     lv_choice=0;
     break;
    }
   case 5:                    //Return to Main Menu.
    {
     lv_choice=1;
     break;
    }
   default:                   //If any other characters are inputted.
    {
     f_dialog_border();
     gotoxy(19,25);
     printf("Invalid entry. Please use numeric values only.");
     getch();
     lv_choice=0;
     break;
    }
  }
 }while(!lv_choice);          //End of while loop.
}





void f_login_border(void)   //Login border function to draw border on login.
{
 int x=23;             //Sets variables X,Y as horizontal and vertical lines.
 int y=24;

 gotoxy(x,x);          //This is the top left corner.
 cprintf("%c",201);
 gotoxy(60,x);         //This is the top right corner.
 cprintf("%c",187);
 gotoxy(x,31);         //This is the bottom left corner.
 cprintf("%c",200);
 gotoxy(60,31);        //This is the bottom right corner.
 cprintf("%c",188);
 for(y=24;y<=30;y++)   //This is the loop that makes the vertical lines.
 {
  gotoxy(23,y);
  cprintf("%c",186);
  gotoxy(60,y);
  cprintf("%c",186);
 }
 y=23;                 //Resetting variable values for use in next loop.
 x=24;
 for(x=24;x<60;x++)    //This is the loop that makes the horizontal lines.
 {
  gotoxy(x,y);
  cprintf("%c",205);
  gotoxy(x,31);
  cprintf("%c",205);
  gotoxy(x,29);
  cprintf("%c",196);
 }
 gotoxy(23,29);        //This is the 'T' for the left vertical line.
 cprintf("%c",199);
 gotoxy(60,29);        //This is the 'T' for the right vertical line.
 cprintf("%c",182);
}







void f_main_border(void) //Main border function to draw borders on menus.
{
 int x=10;             //Sets variables X,Y for horizontal and vertical lines.
 int y=14;

 gotoxy(10,13);        //This is the top left corner.
 cprintf("%c",201);
 gotoxy(74,13);        //This is the top right corner.
 cprintf("%c",187);
 gotoxy(10,34);        //This is the bottom left corner.
 cprintf("%c",200);
 gotoxy(74,34);        //This is the bottom right corner.
 cprintf("%c",188);

 for(y=14;y<=33;y++)   //This loop makes the vertical lines on both sides.
 {
  gotoxy(x,y);
  cprintf("%c",186);
  gotoxy(x+64,y);
  cprintf("%c",186);
 }
 y=13;                 //Resetting variable values for use in next loop.
 x=11;
 for(x=11;x<74;x++)    //This loop makes the horizontal lines above and below.
 {
  gotoxy(x,y);
  cprintf("%c",205);
  gotoxy(x,y+2);
  cprintf("%c",196);
  gotoxy(x,y+21);
  cprintf("%c",205);
 }
 gotoxy(10,y+2);        //This is the 'T' for the left vertical line.
 cprintf("%c",199);
 gotoxy(74,y+2);        //This is the 'T' for the right vertical line.
 cprintf("%c",182);
}


void f_dialog_border()
{
 int x=8;
 int y=20;
 gotoxy(7,20);         //This is the top left corner.
 cprintf("%c",201);
 gotoxy(77,20);        //This is the top right corner.
 cprintf("%c",187);
 gotoxy(7,31);         //This is the bottom left corner.
 cprintf("%c",200);
 gotoxy(77,31);        //This is the bottom right corner.
 cprintf("%c",188);
 for(x=8;x<=76;x++)    //This loop creates the horizontal lines.
 {
  gotoxy(x,y);
  cprintf("%c",205);
  gotoxy(x,y+11);
  cprintf("%c",205);
 }
 y=21;
 for(y=21;y<31;y++)    //This loop creates the vertical lines.
 {
  gotoxy(7,y);
  cprintf("%c",186);
  printf("\t\t\t\t\t\t\t\t\t");
  gotoxy(77,y);
  cprintf("%c",186);
 }
 gotoxy(13,23);
}





char f_encrypt_password(char lv_pass[])  //Encrypts password for security.
{
 int lv_counter=0;
 int lv_length=strlen(lv_pass);
 for(lv_counter=0;lv_counter<=lv_length;lv_counter++)  //Changes every character in password string.
 {
  lv_pass[lv_counter]=2*lv_pass[lv_counter]+15;
 }
 return lv_pass[v_length];   //Returns encrypted password to last function.
}




void f_student_options(void)    //Student Options Menu function.
{
 int lv_counter=1;
 int lv_choice=0;
 int lv_s_options=0;
 do{
  clrscr();
  gotoxy(34,14);
  printf("Student Options\n");     //Menu title.
  for(lv_counter=1;lv_counter<=4;lv_counter++)  //Loop lays out numbers in menu.
  {
   printf("\n\n\t\t%i.",lv_counter);
  }
  gotoxy(19,17);
  printf("Add Student");            //1.
  gotoxy(19,19);
  printf("Search for Student");     //2.
  gotoxy(19,21);
  printf("Remove Student");         //3.
  gotoxy(19,23);
  printf("Return to Main Menu");    //4.
  gotoxy(17,29);
  printf("Input:");
  f_main_border();
  gotoxy(23,29);
  scanf("%i",&lv_s_options);
  v_garbage=getchar();
   lv_s_options;
  switch(lv_s_options)
   {
    case 1:                        //Add Student.
     f_add_student();
     lv_choice=0;
     return;
    case 2:                        //Search for Student.
     f_search_student();
     lv_choice=0;
     return;
    case 3:                        //Remove Student.
     f_remove_student();
     lv_choice=0;
     return;
    case 4:                        //Return to Main Menu.
     lv_choice=1;
     break;
    default:
     f_dialog_border();
     gotoxy(19,25);
     printf("Invalid entry. Please use numeric values only.");
     lv_choice=0;
     getch();
     return;
   }
 }while(!lv_choice);
}



void f_add_student(void)
{
 int lv_id;
 student_rec s_students;
 char lv_continue;
 int lv_cancel;
 clrscr();
 if((file_student_rec=fopen(c_student_rec,"rb+"))==NULL)
  {
   f_dialog_border();
   gotoxy(13,24);
   printf("First student addition, a file will be created to store your");
   gotoxy(37,27);
   printf("information.");
   getch();
   s_students.id=1;
   clrscr();
   file_student_rec=fopen(c_student_rec,"a+");
  }
 else
  {
   do{
 //   lv_id=s_students.id;
   }while(fread(&s_students,sizeof(student_rec),1,file_student_rec));
 //  }while(!feof(file_student_rec));
   s_students.id=lv_id+1;
  }
 f_clear_variable(s_students.fname);
 f_clear_variable(s_students.lname);
 f_clear_variable(s_students.address);
 f_clear_variable(s_students.phone);
 s_students.age=0;
 s_students.gender=0x00;
 do{
  clrscr();
  gotoxy(36,14);
  printf("Add Student");
  gotoxy(15,17);
  printf("ID: %05i",s_students.id);
  gotoxy(15,19);
  printf("First Name:");
  gotoxy(15,21);
  printf("Last Name:");
  gotoxy(15,23);
  printf("Address:");
  gotoxy(15,25);
  printf("Age:");
  gotoxy(15,27);
  printf("Gender:");
  gotoxy(15,29);
  printf("Phone Number:");
  f_main_border();
  gotoxy(28,19);
  gets(s_students.fname);
  gotoxy(27,21);
  gets(s_students.lname);
  gotoxy(24,23);
  gets(s_students.address);
  gotoxy(20,25);
  scanf("%i",&s_students.age);
  v_garbage=getchar();
  gotoxy(23,27);
  scanf("%c",&s_students.gender);
  v_garbage=getchar();
  gotoxy(30,29);
  gets(s_students.phone);
  f_dialog_border();
  printf("Are you sure you want to add this student to student records[y/n]?");
  scanf("%c",&lv_continue);
  v_garbage=getchar();
  if(lv_continue=='n' || lv_continue=='N')
   lv_cancel=1;
  else
   lv_cancel=0;
 }while(lv_cancel==1);
 s_students.s_grades.History=0;
 s_students.s_grades.Geography=0;
 s_students.s_grades.Math=0;
 s_students.s_grades.English=0;
 s_students.s_grades.Humanities=0;
 s_students.s_grades.Science=0;
 s_students.s_grades.Art=0;
 s_students.s_grades.PE=0;
 fwrite(&s_students,sizeof(student_rec),1,file_student_rec);
 fclose(file_student_rec);
}


void f_search_student(void)
{
 clrscr();
 getch();
}


void f_remove_student(void)
{
 clrscr();
 getch();
}


char f_clear_variable(char lv_dirty[])        //Cleans out array for re-use.
{
 int lv_counter=0;
 for(lv_counter=0;lv_counter<50;lv_counter++)
 {
  lv_dirty[lv_counter]=0x00;
 }
 return lv_dirty[strlen(lv_dirty)];
}

//PH's program: phprog.c
//Global variables are marked as v_*
//Local variables are marked as lv_*
//Axes variables are named as x and y
//Functions are marked as f_*
//Files are marked as file_*
//File locations are marked as c_*
//Structures are marked as s_*
#include<conio.h>
#include<string.h>
#include<stdio.h>
#include<ctype.h>
#define v_length 17

void f_loginapproved(void);    //Function prototypes.
void f_logout(void);
void f_read_pass(void);
void f_change_password(void);
void f_write_pass(char[v_length]);
void f_login_border(void);
void f_main_border(void);
void f_main_options(void);
void f_student_options(void);
char f_encrypt_password(char[v_length]);
void f_add_student(void);
void f_search_student(void);
void f_remove_student(void);
void f_dialog_border(void);
char f_clear_variable(char[]);
char v_uname[v_length]="Admin001";  //Default username and password global variables.
char v_passw[v_length]="password";
char c_filename[20]="login.dat"; //Password file for login.
char c_student_rec[20]="stud.dat";
char c_staff_rec[20]="staff.dat";
char v_garbage[20];
FILE *file_password;
FILE *file_student_rec;
FILE *file_staff_rec;
struct sgrades
{
  int History;
  int Geography;
  int Math;
  int English;
  int Humanities;
  int Science;
  int Art;
  int PE;
};
struct student_rec
{
  int id;
  char fname[15];
  char lname[15];
  char address[50];
  int age;
  char gender;
  char phone[15];
  struct sgrades s_grades;  //88888888888
};
struct staff_rec
{
  char fname[15];
  char lname[15];
  char address[50];
  int age;
  int id;
  long int phone;
  char gender;
  double monthly_pay;
};

int main(void)    //Main function used as login screen. 
//Always int main(), with a return (0 is normal, by custom).
{
// clrscr();
//f_read_pass();            //Moves to function to update password variable.
//Can't call functions and make commands before you finish
//declaring your variables in Turbo C. 
//Some later C standards will allow it.

 char lv_name[v_length]="";         //Sets local input variables for login.
 char lv_pass[v_length]="";
 int lv_garbage;  //8888888888
 int lv_valid;             //Sets variable to count attempts in loop.
 int lv_attempt=0;

 clrscr();  //8888888
 f_read_pass();  //88888888888
 do{
  f_login_border();        //Draws login border.
  gotoxy(32,25);
  printf("Username:");     //Displays username and password labels.
  gotoxy(32,27);
  printf("Password:");
  gotoxy(43,25);
  gets(lv_name);           //Gets input of username and password from user.
  gotoxy(43,27);
  gets(lv_pass);
  f_encrypt_password(lv_pass);
  if(strcmp(lv_name,v_uname)!=0 || strcmp(lv_pass,v_passw)!=0)    //Compares inputted password and username with file-saved password and default username.
   {
    lv_attempt++;
    lv_valid=0;
    gotoxy(27,30);
    printf("Incorrect username or password"); //Error message if wrong input.
    getch();
    clrscr();
   }
  else                   //If input is correct local variable valid is 1.
    lv_valid=1;
  }while(!lv_valid && lv_attempt<3);  //Loops until more than 3 tries or valid is 1.
  if(lv_attempt>2 && !lv_valid)
   {
    gotoxy(18,30);
    printf("Sorry, maximum of three(3) attempts reached");  //Error message after 3 wrong tries.
    getch();
   }
  else
   {
    f_loginapproved();   //Main menu function to display all options.
   }
   printf("\n\n\t\t\t     press Enter when ready");
   lv_garbage = getchar();
   lv_garbage++;
   return 0;
}

void f_loginapproved(void) //LoginApproved function to enter menu after login.
{
 int lv_mainmenu=0;    //Sets variable for user input.
 int lv_choice=0;
 int lv_counter=1;
 int lv_garbage;
 do{
  clrscr();
  gotoxy(37,14);
  printf("Main Menu\n");
  for(lv_counter=1;lv_counter<=5;lv_counter++)
  {
   printf("\n\n\t\t%i.",lv_counter);
  }
  gotoxy(19,17);
  printf("Main Options");       //1.
  gotoxy(19,19);
  printf("Student Options");    //2.
  gotoxy(19,21);
  printf("Staff Options");      //3.
  gotoxy(19,23);
  printf("");			//4.
  gotoxy(19,25);
  printf("Exit");               //5.
  gotoxy(17,29);
  printf("Input:");
  f_main_border();      //Draws main border around main menu.
  gotoxy(23,29);
  scanf("%i",&lv_mainmenu);
  lv_garbage=getchar(); //888888888 not v_garbage
  switch(lv_mainmenu)   //Checks user input with possible answers.
  {
   case 1:              //Main Options.
   {
    f_main_options();
    break;
   }
   case 2:              //Student Options.
   {
    f_student_options();
    break;
   }
   case 3:              //Not specified.
   {
    printf("Sorry, this option is currently unavailable");
    getch();
    lv_choice=0;
    break;
   }
   case 4:              //Not specified.
   {
    printf("Sorry, this option is currently unavailable");
    getch();
    lv_choice=0;
    break;
   }
   case 5:              //Logout.
   {
    f_logout();
    lv_choice=1;
    break;
   }
   default:             //If any other character is inputted.
   {
    f_dialog_border();
    gotoxy(19,25);
    printf("Invalid entry. Please use numeric values only.");
    getch();
    lv_choice=0;
    break;
   }
  }
 }while(lv_choice==0);   //End of while loop.
 lv_garbage++;
}

void f_read_pass(void)   //Read password function to read saved password file.
{
 if((file_password=fopen(c_filename,"rb+"))==NULL)    //Opens password file and checks if empty.
 {
  printf("No password, default=password");
  getch();
  f_encrypt_password(v_passw);    //Encrypts default password.
  clrscr();
 }
 else
  fscanf(file_password,"%s",v_passw); //Reads password and updates variable.
 fclose(file_password);
}

void f_change_password(void)  //Password function to edit password variables.
{
 char lv_pass[v_length]="";
 char lv_garbage;
 clrscr();
 f_main_border();
 gotoxy(34,14);
 printf("Change Password");
 gotoxy(15,16);
 printf("Use this option to change your login password. Make sure");
 gotoxy(17,17);
 printf("it is a password that you remember. Your password is");
 gotoxy(19,18);
 printf("encrypted and safely stored until next login.");
 gotoxy(15,23);
 printf("Enter current password: ");  //Current password test before edit.
 gets(lv_pass);
 f_encrypt_password(lv_pass);
 if(strcmp(lv_pass,v_passw)!=0)   //Asks for current password before prompting for new password.
 {
  f_dialog_border();
  printf("Wrong current password entered. The password has not been");
  gotoxy(14,26);
  printf("changed. Press any key to return to Main Options menu...");    //Error message, does not change password and returns to main menu.
  getch();
 }
 else
 {
  gotoxy(15,28);
  printf("Enter new password [17 characters max]: ");   //Request new password.
  f_clear_variable(lv_pass);   //Empties lv_pass array to be used.
  gets(lv_pass);
  lv_garbage=getchar(); //8888888
  f_write_pass(lv_pass);      //Sends lv_pass array to function as argument.
  f_dialog_border();
  gotoxy(29,25);
  printf("Password has been changed.");
  getch();
 }
 lv_garbage++;
}

void f_write_pass(char lv_npass[])     //Password writing function to edit password.
{
 f_encrypt_password(lv_npass);   //Sends lv_pass to be encrypted before continue.
 strncpy(v_passw,lv_npass,v_length);   //Updates global variable with new password.
 file_password=fopen(c_filename,"wb+"); //Erases old password file with blank.
 fprintf(file_password,"%s",v_passw);  //Saves new password in blank file.
 fclose(file_password);
}

void f_logout(void)        //Logout function to exit program at main menu.
{
 char lv_cancel;
 f_dialog_border();
 gotoxy(22,25);
 printf("Logging out. Press any key to exit program..."); //Displays logout message.
 getch();
}
void f_main_options(void)   //Main options funtion to personalise menu.
{
 int lv_options=0;
 int lv_choice=0;
 int lv_counter=1;
 int lv_garbage;
 do{
  clrscr();
  gotoxy(35,14);
  printf("Main Options\n");                 //Title of menu.
  for(lv_counter=1;lv_counter<=5;lv_counter++)    //Loop lays out numbers for menu.
  {
   printf("\n\n\t\t%i.",lv_counter);
  }
  gotoxy(19,17);
  printf("Change Password");      //1.
  gotoxy(19,25);
  printf("Return to Main Menu");  //5.
  gotoxy(17,29);
  printf("Input:");
  f_main_border();       //Draws main border around labels.
  gotoxy(23,29);
  scanf("%i",&lv_options);    //Gets user input.
  lv_garbage=getchar(); //888888888
  switch(lv_options)
  {
   case 1:                    //Change Password.
    {
     f_change_password();
     lv_choice=0;
     break;
    }
   case 2:                    //Not Specified.
    {
     f_dialog_border();
     printf("Sorry, this option is currently unavailable");
     getch();
     lv_choice=0;
     break;
    }
   case 3:                    //Not Specified.
    {
     f_dialog_border();
     printf("Sorry, this option is currently unavailable");
     getch();
     lv_choice=0;
     break;
    }
   case 4:                    //Not Specified.
    {
     f_dialog_border();
     printf("Sorry, this option is currently unavailable");
     getch();
     lv_choice=0;
     break;
    }
   case 5:                    //Return to Main Menu.
    {
     lv_choice=1;
     break;
    }
   default:                   //If any other characters are inputted.
    {
     f_dialog_border();
     gotoxy(19,25);
     printf("Invalid entry. Please use numeric values only.");
     getch();
     lv_choice=0;
     break;
    }
  }
 }while(!lv_choice);          //End of while loop.
 lv_garbage++;
}

void f_login_border(void)   //Login border function to draw border on login.
{
 int x=23;             //Sets variables X,Y as horizontal and vertical lines.
 int y=24;

 gotoxy(x,x);          //This is the top left corner.
 cprintf("%c",201);
 gotoxy(60,x);         //This is the top right corner.
 cprintf("%c",187);
 gotoxy(x,31);         //This is the bottom left corner.
 cprintf("%c",200);
 gotoxy(60,31);        //This is the bottom right corner.
 cprintf("%c",188);
 for(y=24;y<=30;y++)   //This is the loop that makes the vertical lines.
 {
  gotoxy(23,y);
  cprintf("%c",186);
  gotoxy(60,y);
  cprintf("%c",186);
 }
 y=23;                 //Resetting variable values for use in next loop.
 x=24;
 for(x=24;x<60;x++)    //This is the loop that makes the horizontal lines.
 {
  gotoxy(x,y);
  cprintf("%c",205);
  gotoxy(x,31);
  cprintf("%c",205);
  gotoxy(x,29);
  cprintf("%c",196);
 }
 gotoxy(23,29);        //This is the 'T' for the left vertical line.
 cprintf("%c",199);
 gotoxy(60,29);        //This is the 'T' for the right vertical line.
 cprintf("%c",182);
}

void f_main_border(void) //Main border function to draw borders on menus.
{
 int x=10;             //Sets variables X,Y for horizontal and vertical lines.
 int y=14;

 gotoxy(10,13);        //This is the top left corner.
 cprintf("%c",201);
 gotoxy(74,13);        //This is the top right corner.
 cprintf("%c",187);
 gotoxy(10,34);        //This is the bottom left corner.
 cprintf("%c",200);
 gotoxy(74,34);        //This is the bottom right corner.
 cprintf("%c",188);

 for(y=14;y<=33;y++)   //This loop makes the vertical lines on both sides.
 {
  gotoxy(x,y);
  cprintf("%c",186);
  gotoxy(x+64,y);
  cprintf("%c",186);
 }
 y=13;                 //Resetting variable values for use in next loop.
 x=11;
 for(x=11;x<74;x++)    //This loop makes the horizontal lines above and below.
 {
  gotoxy(x,y);
  cprintf("%c",205);
  gotoxy(x,y+2);
  cprintf("%c",196);
  gotoxy(x,y+21);
  cprintf("%c",205);
 }
 gotoxy(10,y+2);        //This is the 'T' for the left vertical line.
 cprintf("%c",199);
 gotoxy(74,y+2);        //This is the 'T' for the right vertical line.
 cprintf("%c",182);
}


void f_dialog_border()
{
 int x=8;
 int y=20;
 gotoxy(7,20);         //This is the top left corner.
 cprintf("%c",201);
 gotoxy(77,20);        //This is the top right corner.
 cprintf("%c",187);
 gotoxy(7,31);         //This is the bottom left corner.
 cprintf("%c",200);
 gotoxy(77,31);        //This is the bottom right corner.
 cprintf("%c",188);
 for(x=8;x<=76;x++)    //This loop creates the horizontal lines.
 {
  gotoxy(x,y);
  cprintf("%c",205);
  gotoxy(x,y+11);
  cprintf("%c",205);
 }
 y=21;
 for(y=21;y<31;y++)    //This loop creates the vertical lines.
 {
  gotoxy(7,y);
  cprintf("%c",186);
  printf("\t\t\t\t\t\t\t\t\t");
  gotoxy(77,y);
  cprintf("%c",186);
 }
 gotoxy(13,23);
}





char f_encrypt_password(char lv_pass[])  //Encrypts password for security.
{
 int lv_counter=0;
 int lv_length=strlen(lv_pass);
 for(lv_counter=0;lv_counter<=lv_length;lv_counter++)  //Changes every character in password string.
 {
  lv_pass[lv_counter]=2*lv_pass[lv_counter]+15;
 }
 return lv_pass[v_length];   //Returns encrypted password to last function.
}




void f_student_options(void)    //Student Options Menu function.
{
 int lv_counter=1;
 int lv_choice=0;
 int lv_s_options=0;
 int lv_garbage;
 do{
  clrscr();
  gotoxy(34,14);
  printf("Student Options\n");     //Menu title.
  for(lv_counter=1;lv_counter<=4;lv_counter++)  //Loop lays out numbers in menu.
  {
   printf("\n\n\t\t%i.",lv_counter);
  }
  gotoxy(19,17);
  printf("Add Student");            //1.
  gotoxy(19,19);
  printf("Search for Student");     //2.
  gotoxy(19,21);
  printf("Remove Student");         //3.
  gotoxy(19,23);
  printf("Return to Main Menu");    //4.
  gotoxy(17,29);
  printf("Input:");
  f_main_border();
  gotoxy(23,29);
  scanf("%i",&lv_s_options);
  lv_garbage=getchar();
//888888888 ?? ===>  lv_s_options;
  switch(lv_s_options)
   {
    case 1:                        //Add Student.
     f_add_student();
     lv_choice=0;
     return;
    case 2:                        //Search for Student.
     f_search_student();
     lv_choice=0;
     return;
    case 3:                        //Remove Student.
     f_remove_student();
     lv_choice=0;
     return;
    case 4:                        //Return to Main Menu.
     lv_choice=1;
     break;
    default:
     f_dialog_border();
     gotoxy(19,25);
     printf("Invalid entry. Please use numeric values only.");
     lv_choice=0;
     getch();
     return;
   }
 }while(!lv_choice);
 lv_garbage++;
}



void f_add_student(void)
{
 int lv_id;
 int lv_garbage;
 struct student_rec s_students;  //888888888888 add "struct"
 char lv_continue;
 int lv_cancel;
 clrscr();
 if((file_student_rec=fopen(c_student_rec,"rb+"))==NULL)
  {
   f_dialog_border();
   gotoxy(13,24);
   printf("First student addition, a file will be created to store your");
   gotoxy(37,27);
   printf("information.");
   getch();
   s_students.id=1;
   clrscr();
   file_student_rec=fopen(c_student_rec,"a+");
  }
 else
  {
   do{
 //   lv_id=s_students.id;
   }while(fread(&s_students,sizeof(s_students),1,file_student_rec));
 //  }while(!feof(file_student_rec));
   s_students.id=lv_id+1;
  }
 f_clear_variable(s_students.fname);
 f_clear_variable(s_students.lname);
 f_clear_variable(s_students.address);
 f_clear_variable(s_students.phone);
 s_students.age=0;
 s_students.gender=0x00;
 do{
  clrscr();
  gotoxy(36,14);
  printf("Add Student");
  gotoxy(15,17);
  printf("ID: %05i",s_students.id);
  gotoxy(15,19);
  printf("First Name:");
  gotoxy(15,21);
  printf("Last Name:");
  gotoxy(15,23);
  printf("Address:");
  gotoxy(15,25);
  printf("Age:");
  gotoxy(15,27);
  printf("Gender:");
  gotoxy(15,29);
  printf("Phone Number:");
  f_main_border();
  gotoxy(28,19);
  gets(s_students.fname);
  gotoxy(27,21);
  gets(s_students.lname);
  gotoxy(24,23);
  gets(s_students.address);
  gotoxy(20,25);
  scanf("%i",&s_students.age);
  lv_garbage=getchar();
  gotoxy(23,27);
  scanf("%c",&s_students.gender);
  lv_garbage=getchar();
  gotoxy(30,29);
  gets(s_students.phone);
  f_dialog_border();
  printf("Are you sure you want to add this student to student records[y/n]?");
  scanf("%c",&lv_continue);
  lv_garbage=getchar();
  if(lv_continue=='n' || lv_continue=='N')
   lv_cancel=1;
  else
   lv_cancel=0;
 }while(lv_cancel==1);
 s_students.s_grades.History=0;
 s_students.s_grades.Geography=0;
 s_students.s_grades.Math=0;
 s_students.s_grades.English=0;
 s_students.s_grades.Humanities=0;
 s_students.s_grades.Science=0;
 s_students.s_grades.Art=0;
 s_students.s_grades.PE=0;
 fwrite(&s_students,sizeof(s_students),1,file_student_rec); //888888
 fclose(file_student_rec);
 lv_garbage++;
}


void f_search_student(void)
{
 clrscr();
 getch();
}

void f_remove_student(void)
{
 clrscr();
 getch();
}

char f_clear_variable(char lv_dirty[])        //Cleans out array for re-use.
{
 int lv_counter=0;
 for(lv_counter=0;lv_counter<50;lv_counter++)
 {
  lv_dirty[lv_counter]=0x00;
 }
 return lv_dirty[strlen(lv_dirty)];
}