Thread: ???confused???

Code:

#include <stdio.h>
#include <string.h>

struct create_account
{
   char username[16];
   char pass[16];
   char conf_pass[16];
};

struct login
{
   char username[16];
   char pass[16];
};


int main()
{
   struct create_account c;
   struct login l;
   
   FILE *fp = NULL;
   
   char user[16];
   char pass[16];
   
   short int condition = 0;
   short int i = 0;
   short int j = 0;
   short int k = 0;
   char opt_no = 0;
   
   while(k = 0);
   {
   
      printf("\n**************ADMISSION*PROGRAM*FOR****************");
      printf("\n********************STUDENTS***********************");
   
      printf("\n\n");
    
      printf("\n1.LOG IN");
      printf("\n2.CREATE USER");
      printf("\n3.EXIT PROGRAM");
   
      printf("\nEnter Option No.:\t");
      opt_no = getchar();
   
      switch(opt_no)
      {
   
         case '1':
               printf("\nUsername:\t");
               scanf("%s", l.username);
               
               printf("\nPassword:\t");
               scanf("%s", l.pass);
               
               fopen *fp = ("user_account.txt", "r");
               while(fscanf(fp, "%s\t%s", user, pass) == 2)
               {
                  if(user == l.username && pass == l.pass)
                  {
                     printf("YES.");
                  }
               }
               break;
            
         case '2':      
   
               printf("\nEnter Desired Adiminisrator User Name:\t");
               scanf("%s", c.username);
               fp = fopen("user_account.txt", "a");
               
               fprintf(fp, c.username);
               fprintf(fp, "\t");
   
  
               printf("(Enter Desired Password Not Less Than 8 Characters");
               printf("\nAnd Not More Than 16 Characters.)");
   
               while(condition == 0) 
               {
      
                  printf("\n\nPassword:\t\t");
                  scanf("%s", c.pass);
                  j = strlen(c.pass);
                  if(j < 8)
                  {
                     printf("\nError.Password is less than 8 characters.");
                  }
                  if(j > 16)
                  {
                     printf("\nError.Password is more than 16 characters.");
                  }
                  if(j >= 8 && j <= 16)
                  {
                     printf("Confirm Password:\t");
                     scanf("%s", c.conf_pass);
                     i = strcmp(c.pass, c.conf_pass);
         
                     if(i != 0)
                     {
                        printf("Error! Passwords do not match");
                     }
                     if(i == 0)
                     {
                        condition = 1;
                        fprintf(fp, c.pass);
                     }
                     
                     fclose(fp);
                  }
        case '3':
              k =1;
              break;
               }   
      }
   }   
   return 0;
}

There's something wrong with my code it compiled before but then gave me errors after i tried to use FILE.

This is the error:
ideas.c: In function ‘main’:
ideas.c:59:22: error: invalid operands to binary * (have ‘struct FILE * (*)(const char * __restrict__, const char * __restrict__)’ and ‘struct FILE *’)
ideas.c:75:16: warning: format not a string literal and no format arguments
ideas.c:109:25: warning: format not a string literal and no format arguments

Code:

fopen *fp = ("user_account.txt", "r");

/* fopen is not a type, it's a function. instead, use: */

FILE *fp = fopen("user_account.txt", "r");
if (!fp) 
    break;

Why do you have 2 structs that virtually do the same thing?

Thanx i'll try that and as for the 2 structs even though they do the same thing they serve different purposes, i just like to try to make my code easy to interpret.

Code:

#include <stdio.h>
#include <string.h>

struct create_account
{
   char username[16];
   char pass[16];
   char conf_pass[16];
};

struct login
{
   char username[16];
   char pass[16];
};


int main()
{
   struct create_account c;
   struct login l;
   
   FILE *fp = NULL;
   
   char user[16];
   char pass[16];
   
   short int condition = 0;
   short int i = 0;
   short int j = 0;
   short int k = 0;
   char opt_no = 0;
   
   while(k == 0)
   {
   
      printf("\n**************ADMISSION*PROGRAM*FOR****************");
      printf("\n********************STUDENTS***********************");
   
      printf("\n\n");
    
      printf("\n1.LOG IN");
      printf("\n2.CREATE USER");
      printf("\n3.EXIT PROGRAM");
   
      printf("\nEnter Option No.:\t");
      opt_no = getchar();
   
      switch(opt_no)
      {
   
         case '1':
               printf("\nUsername:\t");
               scanf("%s", l.username);
               
               printf("\nPassword:\t");
               scanf("%s", l.pass);
               
               fp = fopen("user_account.txt", "r");
               while(fscanf(fp, "%s\t%s", user, pass) == 2)
               {
                  if(user == l.username && pass == l.pass)
                  {
                     printf("YES.");
                  }
               }
               break;
            
         case '2':      
   
               printf("\nEnter Desired Adiminisrator User Name:\t");
               scanf("%s", c.username);
               FILE *fp = fopen("user_account.txt", "a");
               
               fprintf(fp, "%s\t", c.username);
               fprintf(fp, "\t");
   
  
               printf("(Enter Desired Password Not Less Than 8 Characters");
               printf("\nAnd Not More Than 16 Characters.)");
   
               while(condition == 0) 
               {
      
                  printf("\n\nPassword:\t\t");
                  scanf("%s", c.pass);
                  j = strlen(c.pass);
                  if(j < 8)
                  {
                     printf("\nError.Password is less than 8 characters.");
                  }
                  if(j > 16)
                  {
                     printf("\nError.Password is more than 16 characters.");
                  }
                  if(j >= 8 && j <= 16)
                  {
                     printf("Confirm Password:\t");
                     scanf("%s", c.conf_pass);
                     i = strcmp(c.pass, c.conf_pass);
         
                     if(i != 0)
                     {
                        printf("Error! Passwords do not match");
                     }
                     if(i == 0)
                     {
                        condition = 1;
                        fprintf(fp, "%s\n", c.pass);
                     }
                     
                     fclose(fp);
                     break;
                  }
        case '3':
              k =1;
              break;
               }   
      }
   }   
   return 0;
}

now what i want is for the program to scan a file for the list of available usernames and passwords and compare it to the username and password the user uses to login before continuing with the program, but i don't know how to go about it.