ATM机C语言

Question

所以我必须为我的Intro编程类做一个自动取款机程序，我有点沮丧。我的教授刚刚给我们发邮件说：“在任何情况下你都不应该声明任何指针，你需要使用的指针是函数参数，它们不应该在函数或主函数中重新声明。

你们也需要读一读我在作业中写的评论。大多数(或全部)用户将需要为取款函数添加一个参数，因为要正确地执行此操作，您将需要访问帐户类型。“

我试图不声明主函数中的指针，但会出现错误。我也不确定是否应该使用if/else而不是switch，因为每当它问我是否想要进行另一个事务时，程序就会关闭，而不管我选择哪一个(1、2、3)。

最后一个问题是，在进行交易时，我不知道如何更新所选帐户中的金额。(醋栗球)很混乱..。

我真的很感激我能得到的任何帮助。

//  main.c
//  Project Assignment 2
//
//  Created by Paul Gleichman on 2/22/14.
//  Copyright (c) 2014 Paul Gleichman. All rights reserved.
//

#include <stdio.h>

//* Displays the list of user’s options available
//** Displays the user’s selections and sets the value of the choice
void mainMenu(int *choice);

//Prompts the user for the amount of their deposit and updates the selected account
void DepositMoney( double *currBal);

//Asks the user if they want another transaction
void Repeat(char * doAgain);


//Displays the types of account they would like to access and sets the
//value of the chosen account type
void AccountMenu( char *typeAcct);

//Prompts the user for the amount of the withdrawal, determines if there are
//sufficient funds and updates the selected account if funds are dispensed
void WithdrawMoney( double *currBal);

//Displays the user’s current account balance for the selected account
void ShowBalance( double currBal);

int main()
{
    double preBal = 4325;
    double checking = 575;
    double savings = 3750;
    double currBal;
    int choice;
    char doAgain;
    char typeAcct;

    //Welcome Screen
    printf("***** Welcome to Legendary Bank ***** \n");

   //Ask user what they'd like to do
    printf("** What would you like to do today? ** \n");

    //List options
    mainMenu(&choice);

    switch (choice) {
        case 1:
            AccountMenu(&typeAcct);
            DepositMoney(&currBal);
            Repeat(&doAgain);
            break;
        case 2:
            AccountMenu(&typeAcct);
            WithdrawMoney(&currBal);
            Repeat(&doAgain);
            break;
        case 3:
            AccountMenu(&typeAcct);
            ShowBalance(currBal);
            Repeat(&doAgain);

    }

}

//*Displays the list of user’s options available
//**Displays the user’s selections and sets the value of the choice
void mainMenu(int *choice)
{
    printf("1 - DEPOSIT \n");
    printf("2 - WITHDRAWAL \n");
    printf("3 - CHECK ACCOUNT BALANCE \n");
    printf("Important: ");
    printf("To transfer money first select \n(2) for WITHDRAWAL, then \n(1) for DEPOSIT\n");
    scanf(" %d", choice);
}

//Prompts the user for the amount of their deposit and updates the selected account
void DepositMoney( double *currBal)
{
    printf("How much would you like to deposit?:  \n");
    scanf(" %lf", currBal);
    printf("Thank you, please take your receipt.\n");
}

//Asks the user if they want another transaction
void Repeat(char * doAgain)
{
    int choice;
    printf("Would you like to make another transaction?\n");
    printf("(Y)es / (N)o ? \n");
    scanf(" %c", doAgain);
    do {
        mainMenu(&choice);
    } while (doAgain == 'Y' || doAgain == 'y');
}

//Displays the types of account they would like to access and sets the
//value of the chosen account type
void AccountMenu( char *typeAcct)
{
    printf("Please select account: \n");
    printf("Choose C for Checking\n");
    printf("Choose S for Savings\n");
    scanf(" %c", typeAcct);
}

//Prompts the user for the amount of the withdrawal, determines if there are
//sufficient funds and updates the selected account if funds are dispensed
void WithdrawMoney( double *currBal)
{
    printf("How much would you like to withdraw?\n");
    scanf(" %lf", currBal);
    printf("Thank you, please take your cash and receipt\n");
}

//Displays the user’s current account balance for the selected account
void ShowBalance( double currBal)
{
    printf("You have %lf in your account\n", currBal);
}

Answer 1

你得做这样的事。编辑您的主和重复功能

int main()
{
double preBal = 4325;
double checking = 575;
double savings = 3750;
double currBal;
int choice;
char doAgain =0;
char typeAcct;

//Welcome Screen
while(1){
printf("***** Welcome to Legendary Bank ***** \n");

//Ask user what they'd like to do
printf("** What would you like to do today? ** \n");

//List options
mainMenu(&choice);
    do{
       switch (choice) {
          case 1:
             AccountMenu(&typeAcct);
             DepositMoney(&currBal);
             Repeat(&doAgain);
             break;
           case 2:
             AccountMenu(&typeAcct);
             WithdrawMoney(&currBal);
             Repeat(&doAgain);
             break;
           case 3:
             AccountMenu(&typeAcct);
             ShowBalance(currBal);
             Repeat(&doAgain);
           default :
             printf("invalid Choice");
             Repeat(&doAgain);
       }
    }while(doAgain == 'Y');
printf("//////////////////NEW TRANSACTION//////////////\n")
}
return 0;
}

在你的重复功能中

void Repeat(char * doAgain)
{
int choice;
printf("Would you like to make another transaction?\n");
printf("(Y)es / (N)o ? \n");
scanf(" %c", doAgain);
}