Transaction Processing System

#include<stdio.h>
#include<stdlib.h>
struct account
{
	 int number;
	 long amount;
	 char name[20];
};
void create()
{
	 FILE *fptr;
	 int i, n;
	 struct account acc;
	 if ((fptr = fopen("account.bin","wb")) == NULL)
	 {
		printf("File Cannot Open!");
		exit(1);
	 }
	 printf("Enter Total Number of Customers\n");
	 scanf("%d",&n);
	 for(i= 1; i <= n; i++)
	 {
		acc.number=i;
		printf("Enter Name of User %d : ", i);
		scanf("%s",acc.name);
		printf("Enter Initial Amount of User %d : ", i);
		scanf("%ld",&acc.amount);
		fwrite(&acc, sizeof(struct account), 1, fptr);
	 }
	 fclose(fptr);
}
void view()
{
	 FILE *fptr;
	 int n;
	 struct account acc;
	 if ((fptr = fopen("account.bin","rb")) == NULL)
	 {
	 printf("File Cannot Open!");
	 exit(1);
	 }
	 while(1)
	 {
		printf("\nEnter Customer Number to be view : -1 to stop \n");
		scanf("%d",&n);
		if(n==-1)
			break;
		fseek(fptr,(n-1)*sizeof(struct account),0);
		fread(&acc, sizeof(struct account), 1, fptr);
		printf("Customer Number: %d\t Customer Name: %s \tBalance: %ld",acc.number,acc.name,acc.amount);
	 }
	 fclose(fptr);
}
void transfer()
{
	 int fromno,tono;
	 long tamount;
	 struct account acc,fromacc,toacc;
	 FILE *fptr;
	 if ((fptr = fopen("account.bin","rb+")) == NULL)
	 {
		printf("File Cannot Open!");
		exit(1);
	 }
	 printf("\nEnter From Account No:\n");
	 scanf("%d",&fromno);
	 printf("\nEnter To Account No:\n");
	 scanf("%d",&tono);
	 printf("\nEnter Amount to be transfer:");
	 scanf("%ld",&tamount);
	 fseek(fptr,(fromno-1)*sizeof(struct account),0);
	 fread(&fromacc, sizeof(struct account), 1, fptr);
	 fseek(fptr,(tono-1)*sizeof(struct account),0);
	 fread(&toacc, sizeof(struct account), 1, fptr);
	 fromacc.amount-=tamount;
	 toacc.amount+=tamount;
	 fseek(fptr,(fromno-1)*sizeof(struct account),0);
	 fwrite(&fromacc, sizeof(struct account), 1, fptr);
	 fseek(fptr,(tono-1)*sizeof(struct account),0);
	 fwrite(&toacc, sizeof(struct account), 1, fptr); 
	 fclose(fptr);
}
int main()
{
	 int ch;
	 while(1)
	 {
		 printf("\n______MENU_______\n");
		 printf("1.Create Account\n2.View Account Detail \n3.Transfer Amount\n4.Exit");
		 printf("\nEnter Your Choice: ");
		 scanf("%d",&ch);
		 switch(ch)
		 {
			 case 1:
					create();
					break;
			 case 2:
					view();
					break;
			 case 3:
					transfer();
					break;
			 case 4:
					exit(0);
		 }
	 }
	 return 0;
}