File handing and saving records to file problem
I have an assignment to do a customer application and I have managed to do the following code however, I know very little about files as we didn't do them in depth and whenever I add a new customer it doesn't get saved. Any suggestions please?
Code:
#include <stdio.h>
#include <stdlib.h> //for the clear screen function
#include <string.h>
#include <conio.h> //for getch()
struct customer
{
int custID;
char custName[50];
char custAddress[100];
};
typedef struct customer c;
void load_menu(void);
void customers_menu(void);
void orders_menu(void);
void stock_menu(void);
void createNew(void); //initialize your file
void add_Customer(c c1[30]); //add a new record to the file
void recordCount(c c1[30], int *count);
FILE *fp;
int main(void)
{
/*FILE *pfile;
pfile = fopen("customers.dat","w");
if (pFile!=NULL)
{
fputs ("fopen example",pFile);
fclose (pFile);
getchar(); // pause and wait for key
}
else
{
printf("Could not open the file. \n");
}*/
load_menu();
return 0;
}
void load_menu(void)
{
int choice;
do
{
printf("Customer Orders Main Menu. \n\n");
printf("Please enter your choice: \n");
printf("1. Customer's Menu \n");
printf("2. Orders Menu\n");
printf("3. Product Stock Menu\n");
printf("4. Exit\n");
printf("\n");
if (scanf("%d",&choice)==1)
{
switch(choice)
{
case 1: system ("cls");
customers_menu();
printf("\n");
break;
case 2: system ("cls");
orders_menu();
printf("\n");
break;
case 3: system ("cls");
stock_menu();
printf("\n");
break;
case 4: printf("Quitting program!\n");
break;
default: printf("Invalid choice! Please try again\n");
printf("\n");
break;
}
}
else
{
fflush(stdin);
printf("Characters are invalid, please enter a number: \n ");
choice=0;
}
}while((choice !=4));
}
void createNew(void)
{
FILE *fp;
fp=fopen("Customer.dat", "w");
if (fp==NULL)
printf("File creation failed! \n");
else
{
printf("File created! \n");
printf("Press a key to continue \n");
fflush(stdout );
getchar();
fclose(fp);
system ("cls");
}
}
void add_Customer(c c1[30])
{
int i, n , cc=0;
FILE *fp;
fp=fopen("Customer.dat", "a");
system("cls");
if(fp==NULL)
{
printf("File Creation Failed!");
}
printf("Enter the number of Customers: ");
scanf("%d", &n);
for(i=0;i<n;i++)
{
printf("Customer's ID (numbers only) : ");
scanf("%d", &c1[i].custID);
printf("Customer's Name: ");
scanf("%s", c1[i].custName);
printf("Customer's Address: ");
scanf("%s", c1[i].custAddress);
fwrite(&c1[i], sizeof(c), 1, fp);
}cc++;
fclose(fp);
}
void recordCount(c c1[30], int *count)
{
//add_Customer(c1); (if i use this, the program keeps looping whenever I enter a new customer
count=0;
count++;
}
void displayFile()
{
int nofrec=0;
c cust1;
FILE *fp;
fp=fopen("Customer.dat", "rb");
if(fp==NULL)
{
printf("\n\tFile doesn’t exist!!!\n Plese try again.");
}
system("cls");
while((fread(&cust1, sizeof(cust1), 1, fp))==1)
{
nofrec++;
printf("Customer's ID: %d.\n",cust1.custID);
printf("Customer's Name: %c.\n",cust1.custName);
printf("Customer's Address: %c.\n",cust1.custAddress);
printf("\n\n\n");
}
printf("Total number of records present are : %d", nofrec);
fclose(fp);
}
void customers_menu(void)
{
int choice;
c c1[30];
int i;
do
{
printf("\n");
printf("Customers Menu \n\n");
printf("Please enter your choice: \n");
printf("1. Add Customer \n");
printf("2. Display File \n");
printf("3.\n");
printf("4. Go back to Main Menu \n");
recordCount (c1, &i);
if (scanf("%d",&choice)==1)
{
switch(choice)
{
case 1: add_Customer(c1);
createNew();
printf("\n");
break;
case 2: displayFile();
printf("\n");
break;
case 3:
printf("\n");
break;
case 4: printf("Going back to Main Menu\n");
system ("cls");
break;
default: printf("Invalid choice! Please try again\n");
printf("\n");
break;
}
}
else
{
fflush(stdin);
printf("Characters are invalid, please enter a number: \n ");
choice=0;
}
}while((choice !=4));
}
