为什么我按 0 时程序没有停止？ C程序答案

【问题标题】：Why doesn't my program stop when I press 0? C program为什么我按 0 时程序没有停止？ C程序
【发布时间】：2015-06-27 18:03:15
【问题描述】：

我做了一个简单的程序，询问你是否可以进入酒吧。然后继续问你愿意花多少钱，然后问你第一次买多少钱。它继续询问您是否想购买更多，但是如果我不想购买更多，我可以输入值“0”，但是当我输入“0”时它不会关闭程序。

代码如下：

#include <stdio.h>

int main() {
int age, legal = 18;
float money, buy;

    printf("At the bar the security must ID the customers that look underage, what is your age?: ");
    scanf("%d", &age);

        if(age < legal){
            printf("\nYou are not allowed!\n");
        }

        else if(age >= legal){
            printf("\nYou may enter, and buy whatever you wish!\n");

            printf("\nHow much money are you willing to spend tonight?: ");
            scanf("%f", &money);

            printf("\nWith the %.2f dollars you want to spend tonight what is the price of food or beverage you wish to buy first?: ", money);
            scanf("%f", &buy);

            money = money - buy;

            while(money > 0 || buy==0) {
                printf("\nYou now have %.2f dollars remaining, what else would you like to buy? (Press 0 to stop if you don't wish to buy any more!!): ", money);
                scanf("%f", &buy);
                money = money - buy;
            }
                if(money == 0){
                    printf("\nYou have spent all the money that you wished to spend at the bar, we hope you enjoyed your stay!!\n");
                }

                else if(money > 0){
                    printf("\nYou still have %.2f dollars left, We hope you enjoyed your stay at the bar!!\n");
                } 

        }       
}

【问题讨论】：

请避免将float 或double 用于金钱，因为它们给出的比较不准确。使用int 以美分工作，格式为 dollars.cents 用于输出。拆分. 上的任何输入字符串以将其转换为美分。

标签： c

【解决方案1】：

你的 while 循环是错误的。它说当钱不为零时，或者当购买为零时，询问支出金额。

应该说while(money != 0 && buy > 0)，这样只要他们有钱并且正在消费（购买高于零）就会询问消费金额。

【讨论】：