atm.c

#include <stdio.h>
#include <conio.h>
long amount=1000,deposit,withdraw;
int choice,pin,k;
char transaction ;

void main(){
	while (pin!=1111)
	{
		printf("ENTER YOUR SECRET PIN NUMBER:");
		scanf("%d",&pin);
		if (pin!=1111 )
		printf("PLEASE ENTER VALID PASSWORD\n");
		
		 
	}
	do{
		printf("********Welcome to ATM Service**********\n");
		printf("1. Check Balance\n");
		printf("2. Withdraw Cash\n");
		printf("3. Deposit Cash\n ");
		printf("4. Quit\n");
		printf("******************************************?\n\n");
		printf("Enter your choice: ");
		scanf("%d",&choice);
		switch(choice)
		{
			case 1:
				printf("\n YOUR BALANCE IS :%lu",amount);
				break;
				
		    case 2:
		    printf("\n ENTER THE AMOUNT TO WITHDRAW:  ");
		    scanf("%lu",&withdraw);
		    if(withdraw  % 100!=0)
		    {
		    	printf("\n PLEASE ENTER THE AMOUNT IN MULTIPLES OF 100");
		    
			}
			else if(withdraw>(amount-500))
			{
				printf("\n INSUFFICIENT BALANCE");
			}
			else{
				amount=amount-withdraw;
				printf("\n\n PLEASE COLLECT CASH");
				printf("\n YOUR CURRENT BALANCE IS %lu",amount);
			}
			break;
			case 3:
				printf("\n ENTER THE AMOUNT TO DEPOSIT : ");
				scanf("%lu",&deposit);
				amount= amount + deposit;
				printf("YOUR BAlANCE IS %lu",amount);
				break;
				
				case 4:
					printf("\n THANK YOU FOR USING ATM");
					break;
					default:
						printf("\n INVALID CHOICE");
						
						
		}
		
		printf("\n\n\n DO YOU WISH TO HAVE ANOTHER TRANSACTION?(y/n):\n");
		fflush(stdin);
		scanf("%c",&transaction);
		if (transaction == 'n'|| transaction== 'N' )
		k=1;
	
		
		
	}
	while(!k);
	printf("\n\n THANKS FOR USING OUR ATM SERVICE");
	getch();
}