Question

使用for循环。我想让用户输入他们想要订购的柠檬水量。然后我的程序将计算税额，小计和总计。之后应该让他们继续进入＆＃39; y＆＃39;或者＆＃39; n＆＃39;。
编译这些代码时。我得到的只是空白。我的代码出了什么问题？

所以我做了一些改变。但是，如果我输入＆＃39; n＆＃39; n，我就不知道怎么让它停止。如果他们要求继续。

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>

void main()
{
    int NumCups;
    float SubTot, Tot = 0, Tax;
    char more;

    printf("Enter the number of cups:");
    scanf("%d", &NumCups);
    SubTot = NumCups*1.29;
    Tax = SubTot*0.0825;
    Tot = SubTot + Tax;

    printf("Subtotal:%0.2f\nTax:%0.2f\nTotal:%0.2f\n", SubTot, Tax, Tot);
    fflush(stdin);
    printf("Thank you.\nWould you like to order more lemonade?\n");

    for (; scanf("%c", &more);)
    {
        printf("Enter the number of cups:");
        scanf("%d", &NumCups);

        SubTot = NumCups*1.29;
        Tax = SubTot*0.0825;
        Tot += SubTot + Tax;
        fflush(stdin);
        printf("Subtotal:%0.2f\nTax:%0.2f\nTotal:%0.2f\n", SubTot, Tax, Tot);
        printf("Thank you.\nWould you like to order more lemonade?\n");
    }
    system("pause");
}

Answer 1

试试这个：

 for (; scanf("%c", &more)&&more=='y';)

此更改只允许您在使用y字符时继续。

Answer 2

do {
    printf("Enter the number of cups:");
    scanf("%d", &NumCups);

    SubTot = NumCups*1.29;
    Tax = SubTot*0.0825;
    Tot += SubTot + Tax;
    fflush(stdin);
    printf("Subtotal:%0.2f\nTax:%0.2f\nTotal:%0.2f\n", SubTot, Tax, Tot);
    printf("Thank you.\nWould you like to order more lemonade?\n");
} while(1 == scanf(" %c", &more) && 'y' == more);

如何在char中使用For循环？

2 个答案: