d3_2 简单的取款机系统

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
void menu();
int deposit(int balance);
int withdraw(int balance);
void check(int balance);
void quit();

void main()
{
    int balance=500;
    int menuNumber=0;

    while(menuNumber!=4)//当按菜单4时退出循环
    {
      menu();
      scanf("%d",&menuNumber); 
      switch(menuNumber)
     {
     case 1:balance=deposit(balance);break;
     case 2:balance=withdraw(balance);break;
     case 3:check(balance);break;
     case 4:quit();break;
     default :printf("operator wronng!\n");
     }
        
    }
  
}
//0 menu
void menu(){
    system("color 37");  //change the color of screen and text
   printf("*****************************\n");
   printf("* Menu:                     *\n");
   printf("* 1.Deposit                 *\n");
   printf("* 2.Withdraw                *\n");
   printf("* 3.Check Balance           *\n");
   printf("* 4.Quit                    *\n");
   printf("*****************************\n");
   printf("Enter Your Choice:");
   
    
}

//1 deposit
int deposit(int balance)
{
  int amount,newbalance;
  printf("Enter the amount to Deposit:");
  scanf("%d",&amount);
  newbalance=balance+amount;
  printf("Your balance is %d RMB\n",newbalance);
  return newbalance;

}

//2 withdraw
int withdraw(int balance)
{
  int amount,newbalance;
  printf("Enter the amount to withdraw:");
  scanf("%d",&amount);
  newbalance=balance-amount;
  if(newbalance<0)
  {
      printf(" Sorry InSufficient Balance!!!!\n");
      return balance;
  }else
  {
  printf("Now your balance is %d RMB\n",newbalance);
  return newbalance;
  }



}
//3 check
  void check(int balance){
      printf("Your balance is %d RMB\n",balance);
  
  }
 //4 quit
  void quit(){
      system("cls");
   printf("Thank YOu for Using my BANK!!!!\n");
  }

若balance为全局变量，代码如下：

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
void menu();
void deposit();
void withdraw();
void check();
void quit();
int balance=500;

void main()
{
    
    int menuNumber=0;
    while(menuNumber!=4)//当按菜单4时退出循环
    {
      menu();
      scanf("%d",&menuNumber); 
      switch(menuNumber)
     {
     case 1:deposit();break;
     case 2:withdraw();break;
     case 3:check();break;
     case 4:quit();break;
     default :printf("operator wronng!\n");
     }
        
    }
  
}
//0 menu
void menu(){
    system("color 37");  //change the color of screen and text
   printf("*****************************\n");
   printf("* Menu:                     *\n");
   printf("* 1.Deposit                 *\n");
   printf("* 2.Withdraw                *\n");
   printf("* 3.Check Balance           *\n");
   printf("* 4.Quit                    *\n");
   printf("*****************************\n");
   printf("Enter Your Choice:");
   
    
}

//1 deposit
void deposit()
{
  int amount;
  printf("Enter the amount to Deposit:");
  scanf("%d",&amount);
  balance=balance+amount;
  printf("Your balance is %d RMB\n",balance);
  

}

//2 withdraw
void  withdraw()
{
  int amount,newbalance;
  printf("Enter the amount to withdraw:");
  scanf("%d",&amount);
  newbalance=balance-amount;
  if(newbalance<0)
  {
      printf(" Sorry InSufficient Balance!!!!\n");
     
  }else
  {
     balance=newbalance;
     printf("Now your balance is %d RMB\n",balance); 
  }



}
//3 check
  void check(){
      printf("Your balance is %d RMB\n",balance);
  
  }
 //4 quit
  void quit(){
      system("cls"); //clear the screen
   printf("Thank YOu for Using my BANK!!!!\n");
  }

2014-07-2316:08:35