#include<stdio.h>
int password,menu,new_password;
float balance,withdraw,withdraw_after;
main()
{
 printf("PLEASE ENTER YOUR PASSWORD:\t");
 scanf("%d",&password);
 
  if(password==123456)
  {
   balance=1500;
   printf("MENU SCREEN\n");
   printf("1. Withdraw\n");
   printf("2. Balance Enquiry\n");
   printf("3. Change Password\n");
   printf("4. Exit\n\n");
   printf("Select A Menu:\t");
   scanf("%d",&menu);
    switch(menu)
    {
    case 1:
     printf("Withdraw Menu\n\n");
     printf("User Name:\t Tony");
     printf("Account Balance:\t RM %.2f",balance);
     printf("Enter The Amount You Want To Withdraw:\t");
     scanf("%f",&withdraw);
 
      if(withdraw>balance)
      {
       printf("You Don't Have Enough Money In Your Account");
      }
      else
      {
       withdraw_after=balance-withdraw;
       printf("You Have RM %.2f Left In Your Account",withdraw_after);
      }
    break;
    case 2:
     printf("Balance Enquiry Menu\n");
     printf("User Name:\t Tony");
     printf("Account Balance:\t RM %.2f",balance);
    break;
    case 3:
     printf("Change Password Menu");
     printf("Please Enter A New Password:\t");
     scanf("%d",new_password);
     password=new_password;
    break;
    case 4:
    break;
 
    }
  }
}

#include <stdio.h>
#include <ctype.h>
 
#define FALSE 0
#define TRUE !FALSE
 
int main( void )
{
    int c;
    int done = FALSE;
 
    while( !done )
    {
           puts("\nMENU SCREEN\n");
           puts("W - Withdraw\n");
           puts("B - Balance Enquiry\n");
           puts("C - Change Password\n");
           puts("Q - Quit\n");
           fputs("Select a choice: ", stdout );
           fflush( stdout );
 
           c = getchar();
           c = toupper( c );
 
           switch( c )
           {
            case 'W':
            /* do something here */
                break;
            case 'B':
            /* do something here */    
                break;
            case 'C':
            /* do something here */    
                break;
            case 'Q':
                done = TRUE; /* Exit here */
                break;
            default:
                puts( "Wrong input, choose again" );
                break;
        }
    }
}