Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// number of salesman
#define SIZE 100
// salesman_type structure definition
typedef struct{
//int ID; // salesman id
char id_txt[6]; // salesman id for txt file
char name[50]; // salesman name
double hor_total; // total sales amount of a salesman
}salesman_type; // end structure salesman_type
// function prototype
void sale_menu(int *menu);
void report_menu(int *report);
void deleteSales(int *newId);
void setting(int *tip, int *year);
// sales processing system menu function
void sale_menu(int *menu)
{
system("cls");
printf("Sales Processing System\n");
printf("-----------------------\n\n");
printf("1. Add Salesman Records\n");
printf("2. Reports Generation\n");
printf("3. Modify Salesman Records\n");
printf("4. Delete Salesman Records\n");
printf("5. Change Settings\n\n");
printf("0. Exit\n");
printf("Your choice: ");
scanf("%d", menu);
system("cls");
}// end function sale_menu
// reports generation menu function
void report_menu(int *report)
{
system("cls");
printf("Reports Generation\n");
printf("------------------\n\n");
printf("1. View Quarterly Sales Report\n");
printf("2. View Individual Salesman Commission\n\n");
printf("0. Return to Main Menu\n");
printf("Your choice: ");
scanf("%d", report);
system("cls");
}// end function report_menu
// delete salesman records function
void deleteSales(int *newId)
{
int loop = 1, b, del;// counter
char buffer[100]; // buffer data from one text file to another
// display title
printf("Delete Salesman Records\n");
printf("=======================\n");
// prompt and read salesman id
printf("Salesman ID (NO.): ");
scanf("%d",&del);
// if out of modify salesman record range
if (del > *newId)
{
printf("No record found.\n");
printf("\nPress Enter to continue...\n");
getchar();
getchar(); // prompt user;
}
else
{
// while it is not the targeted salesman id
while (loop < del)
{
// increment loop
loop++;
} // end while
if (del < *newId)
{
} // end while
// display message
printf("\n\nRecord deleted.\n");
system("pause");
} // end else
}// end function deleteSales
// change setting function
void setting(int *getSet, int *chgTip, int *chgYear)
{
// setting.ini file pointer
FILE *setPtr;
// preset setting
char preset[4] = "ON";
// reset input buffer
int ch;
// clear screen display
system("cls");
// if tip is not equal to 1, set the preset to OFF
if (*chgTip != 1)
strcpy(preset,"OFF");
// display title
printf("Settings\n");
printf("--------\n\n");
printf("1. Tips Notification: %s\n", preset);
printf("2. Change Year\n\n");
printf("0. Return to Main Menu\n");
printf("Your choice: ");
scanf("%d", getSet);
// set to OFF status if user change the tip setting
if (*getSet == 1)
{
// if the setting is ON
if (*chgTip == 1)
{
// set preset to OFF
strcpy(preset,"OFF");
// set tip to zero
(*chgTip)--;
// open setting.ini in writing mode
if ( (setPtr = fopen("setting.ini","r")) == NULL)
{
printf("Cannot open setting.ini.\n");
system("pause");
exit(-1);
}
else
{
// read year value
fscanf(setPtr,"%*[^\n]\n%*[^=]=%d",&(*chgYear));
// close setting.ini
fclose(setPtr);
// open setting.ini in writing mode
if ( (setPtr = fopen("setting.ini","w")) == NULL)
{
printf("Cannot writting file to system. Check the system.\n");
system("pause");
exit(-1);
} // end if
else
{
// write tip value
fprintf(setPtr,"tip = %d\n",*chgTip);
// write year value
fprintf(setPtr,"year = %d",*chgYear);
} // end else
// close setting.ini
fclose(setPtr);
} // end else
} // end if
else
{
strcpy(preset,"ON");
(*chgTip)++;
// open setting.ini in writing mode
if ( (setPtr = fopen("setting.ini","r")) == NULL)
{
printf("Cannot open setting.ini.\n");
system("pause");
exit(-1);
}
else
{
// read year value
fscanf(setPtr,"%*[^\n]\n%*[^=]=%d",&(*chgYear));
// close setting.ini
fclose(setPtr);
// open setting.ini in writing mode
if ( (setPtr = fopen("setting.ini","w")) == NULL)
{
printf("Cannot writting file to system. Check the system.\n");
system("pause");
exit(-1);
} // end if
else
{
// write tip value
fprintf(setPtr,"tip = %d\n",*chgTip);
// write year value
fprintf(setPtr,"year = %d",*chgYear);
} // end else
// close setting.ini
fclose(setPtr);
} // end else
} // end else
} // end if
// clear display buffer
system("cls");
// change year
if (*getSet == 2)
{
printf("Year: ");
scanf("%d",&(*chgYear));
// open setting.ini in writing mode
if ( (setPtr = fopen("setting.ini","r")) == NULL)
{
printf("Cannot open setting.ini.\n");
system("pause");
exit(-1);
}
else
{
// read year value
fscanf(setPtr,"%*[^=]=%d",&(*chgTip));
// close setting.ini
fclose(setPtr);
// open setting.ini in writing mode
if ( (setPtr = fopen("setting.ini","w")) == NULL)
{
printf("Cannot writting file to system. Check the system.\n");
system("pause");
exit(-1);
} // end if
else
{
// write tip value
fprintf(setPtr,"tip = %d\n",*chgTip);
// write year value
fprintf(setPtr,"year = %d",*chgYear);
} // end else
// close setting.ini
fclose(setPtr);
} // end else
} // end if
// clear display buffer
system("cls");
} // end function setting
// function main begins program execution
int main()
{
// variable declaration
int a, b, c = 0, last; // counter
int getMenu = 10, getReport = 10, getSet = 10; // menu selector
double ver_total = 0, max = 0;
int lastId; // last saved salesman id
int tip; // tip setting
int year; // year setting
int resetId = 0; // pass value execute assignment of nextId function
// while the user input is not zero
while (getMenu != 0)
{
// call sale_menu function, prompt and read user input
sale_menu(&getMenu);
// Execute function based on user input
switch(getMenu)
{
case 1:
break;
// call report_menu function
case 2:
// Call report_menu,prompt and read user input
report_menu(&getReport);
break;
case 3:
break;
case 4:
// call deleteSales function
deleteSales(&lastId);
case 5:
// call setting function
setting(&getSet, &tip, &year);
// loop the function until user exit the function
while (getSet != 0)
{
setting(&getSet, &tip, &year);
}
} // end switch
}// end while
return 0; // end program
} // end main
Input 4 then 4. 
