ATM Machine Project .c

#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

// Functions
void login();
void mainMenu();
void checkBalance(float balance);
float moneyDeposit(float balance);
float moneyWithdraw(float balance);
void menuExit();
void changepin();
void moneytransfer();
void errorMessage();
int pin=1234;
float balance = 15000.00;

// Main Code
int main() 
{
  int p;
  printf("----------------------------------------PIN=1234--------------------------------------\n");
  printf("Enter Pin: \n");
  scanf("%d", &p);
  if (p == pin) {
    int option;
    int choose;

    bool again = true;

    while (again) {
      mainMenu();

      printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-\n");
      printf("Your Selection:\t");
      scanf("%d", &option);

      switch (option) {
      case 1:
        system("CLS");
        checkBalance(balance);
        break;
      case 2:
        system("CLS");
        balance = moneyDeposit(balance);
        break;
      case 3:
        system("CLS");
        balance = moneyWithdraw(balance);
        break;

      case 4:
        system("CLS");
        moneytransfer();
        break;
	  
	  case 5:
        system("CLS");
        changepin();
        break;

      case 6:
        system("CLS");
        menuExit();
        return 0;

      default:
        errorMessage();
        break;
      }

      printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n");
      printf("Would you like to do another transaction:\n");
      printf("< 1 > Yes\n");
      printf("< 2 > No\n");
      scanf("%d", &choose);

      system("CLS");

      if (choose == 2) {
        again = false;
        menuExit();
      }
    }

    return 0;
  } else {
    system("CLS");
	printf("Invalid Pin !! \n");
    main();
  }
}

// Functions

// Main Menu
void mainMenu() {

  printf("******************Hello!*******************\n");
  printf("**********Welcome to ATM Banking***********\n\n");
  printf("****Please choose one of the options below****\n\n");
  printf("< 1 >  Check Balance\n");
  printf("< 2 >  Deposit\n");
  printf("< 3 >  Withdraw\n");
  printf("< 4 >  Money Transfer\n");
  printf("< 5 >  Change Pin\n");
  printf("< 6 >  Exit\n\n");

} 

// Check Balance
void checkBalance(float balance) {
  printf("You Choose to See your Balance\n");
  printf("\n\n****Your Available Balance is:   $%.2f\n\n", balance);

}

// money deposit
float moneyDeposit(float balance) {
  float deposit;
  printf("You choose to Deposit a money\n");
  printf("$$$$Your Balance is: $%.2f\n\n", balance);
  printf("****Enter your amount to Deposit\n");
  scanf("%f", &deposit);

  balance += deposit;

  printf("\n****Your New Balance is:   $%.2f\n\n", balance);
  return balance;

} 

// money withdraw
float moneyWithdraw(float balance) {
  float withdraw;
  bool back = true;

  printf("You choose to Withdraw a money\n");
  printf("$$$$Your Balance is: $%.2f\n\n", balance);

  while (back) {
    printf("Enter your amount to withdraw:\n");
    scanf("%f", &withdraw);

    if (withdraw < balance) {
      back = false;
      balance -= withdraw;
      printf("\n$$$$Your withdrawing money is:  $%.2f\n", withdraw);
      printf("****Your New Balance is:   $%.2f\n\n", balance);

    }

    else {

      printf("+++You don't have enough money+++\n");
      printf("Please contact to your Bank Customer Services\n");
      printf("****Your Balance is:   $%.2f\n\n", balance);
    }
  }
  return balance;

} 

// exit menu
void menuExit() {
  printf("--------------Take your receipt!!!------------------\n");
  printf("-----Thank you for using ATM Banking Machine!!!-----\n");

} 

// change pin
void changepin()
{
  int oldpin , newpin;
  printf("Enter Old Pin:\n");
  scanf("%d",&oldpin);
  if(oldpin==pin)
  {
  printf("Enter New Pin:\n");
  scanf("%d",&newpin);
  pin=newpin;
  system("CLS");
  printf("Pin is Succesfully Changed \n");
  main();
}
  else{
    printf("Invalid Pin !!!:\n");
    changepin();
  }
}

//money transfer
void moneytransfer()
{
	int accno,amt,p;
	printf("Enter Account Number in which money to be tranfered: \n");
	scanf("%d",&accno);
	printf("Enter Amount: \n");
	scanf("%d",&amt);
	printf("Enter Pin: \n");
	scanf("%d",&p);
	if(p==pin)
	{
		if(amt<balance)
		{
			system("CLS");
			printf("Money Transfered Succesfully \n");
			balance=balance-amt;
			printf("Your remaining Balance is : %f \n",balance);
		}
		else
		{
			printf("Insufficient Balance !!! \n");
		}
	}
	else
	{
			printf("Invalid Pin !!! \n");
	}
}

// error message
void errorMessage() {
  ;
  printf("+++!!!You selected invalid number!!!+++\n");
}