Thread: How do I get my ATM Machine to accept PIN input only a total of 3 tries?

How do I get my ATM Machine to accept PIN input only a total of 3 tries?

Here is my code

Code:

#include<stdio.h>
#include<conio.h>


int main(){


 int balance = 15000;
 int pin = 1016;
 int pin2;
 int newtransaction = 1; //new transaction , 2 end transaction
 
 
 
 printf("***Welcome To Stehl's ATM Machine*** \n");
 printf("Enter Pin: ");
 scanf("%d", &pin2);
 
 if(pin != pin2)
 
 {
 	printf("Pin not Valid.");
 	return 0;
 }
 
 
	 while(newtransaction == 1)
	 {
	 int option;
	 
	 printf("Please pick an option \n");
	 printf("1 - Check your balance \n");
	 printf("2 - Deposit\n");
	 printf("3 - Withdraw\n");
	 scanf("%d" , &option );
	  
	  if (option == 1)//balance
	  
	  {
	  	printf("Your current balance is : %d \n", balance);
	  }
	  
	  else if (option == 2)//deposit
	  {
	  	  int deposit;
	  	  
	  	  
		  printf("Plese input deposit amount: ");
		  scanf("%d", &deposit);
		
		  if(deposit >0 )
		  {
		  balance += deposit;
		  printf("Your total balance is %d \n ", balance);
          }


          else
          {
          	printf("Invalid amount\n");
		  }
		   
	  }
	   
	  else if (option == 3)//withdraw
	  {
	  	int withdraw;
	  	
	  	printf("Please input withdraw amount: ");
	  	scanf("%d", &withdraw);
	  	
	  	if(withdraw <= balance)
	  	{
		balance -= withdraw;
		printf("Your total balance is %d \n", balance);
		}
		else {
		    	if (withdraw > balance)
		    	{
				printf("Insufficient Balance. Declined \n");
		    	}
		    }
	  } 
	  else
	  {
	  	printf("Invalid Transaction.\n");
	  }
	  
	  newtransaction = 0;
	  
	  while(newtransaction != 1 && newtransaction !=2)
	  {
	  printf("Do you want a new transaction?\n");
	  printf("1 - Yes\n");
	  printf("2 - No\n");
	  scanf("%d", &newtransaction);
      }
	}






  getch();
  return 0;
  
}

@nerio: ATM simulation is a common programming exercise, so it shouldn't be surprising to see many variations of this theme throughout the forum.

Originally Posted by Stehl Soriano

How do I get my ATM Machine to accept PIN input only a total of 3 tries?

You already know how to make code repeat: use a loop.

If you only want to allow a certain number of tries, incorporate a counter into the loop.