Question

我正在尝试设置一个程序，它将根据1到7之间的数字的用户输入来判断星期几是什么。每次程序执行时，它都会返回默认的大小写消息，说输入了不正确的值。所有案例条目1-7都会发生这种情况。这是程序的设置（不包括标题）：

//author: Ethan Adams
//date: 10/09/14
//purpose: to determine the day of the week based on user input value

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

int main (void)
{
    int week_day; //value entered by user

    printf("Enter the number of the week's day (1-7):\n");//prompt
    scanf("%d", &week_day); //input value

switch(week_day){
    case '1':
        printf("The day of the week is Sunday.\n");
        break;//exit switch

    case '2':
        printf("The day of the week is Monday.\n");
        break;//exit switch

    case '3':
        printf("The day of the week is Tuesday.\n");
        break;//exit switch

    case '4':
        printf("The day of the week is Wednesday.\n");
        break;//exit switch

    case '5':
        printf("The day of the week is Thursday.\n");
        break;//exit switch

    case '6':
        printf("The day of the week is Friday.\n");
        break;//exit switch

    case '7':
        printf("The day of the week is Saturday.\n");
        break;//exit switch

    default:
        printf("Improper value entered.  Please try again.\n");
        break;//exit switch
}//end switch selection

system ("pause");
}//end main

此外，如果影响任何内容，我正在使用Visual Studio 2012。

Answer 1

您的开关案例适用于char值。请注意，您的案例为case '1':，case '2':，...

因此，您可以将案例陈述从case '1':更改为case 1:

或者

将week_day变量的数据类型更改为char。即。

int week_day;至char week_day;。

更改week_day变量的数据类型后，请确保在scanf语句中进行更改。

将scanf("%d", &week_day);更改为scanf(" %c", &week_day);

switch语句只返回默认情况，无论我输入什么情况值

1 个答案: