案例标签不减少在C整型常量？ [英] Case label does not reduce to an integer constant in C?

问题描述

我工作的一个游戏，我跑我的code和得到了错误的情况下标签不降低到整型常量。我想我知道这意味着什么，但我怎么解决？这里是我的code：

I am working on a game and I ran my code and got the error "case label does not reduce to an integer constant." I think I know what this means, but how do I fix it? Here is my code:

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

int player_cash[3] = {50};
char job[][20] {
    'A',
    'B',
    'C',
    "Donate",
    "Go to work",
    "Exit"
};
int jobs;

int main()
{
    while(player_cash[0] > 0) {
        printf("Please type A, B, C, Donate, Go to work, or Exit\n");
        switch(jobs) {

            case 'A':
            player_cash[0]-=5;
            player_cash[1]+=5;
            printf("Cash=%i\n\n", player_cash[0]);
            continue;

            case 'B':
            player_cash[0]-=5;
            player_cash[2]+=5;
            printf("Cash=%i\n\n", player_cash[0]);
            continue;

            case 'C':
            player_cash[0]-=5;
            player_cash[3]+=5;
            printf("Cash=%i\n\n", player_cash[0]);
            continue;

            case "Donate":
            player_cash[0]-=15; //Error here
            player_cash[1]+=5;
            player_cash[2]+=5;
            player_cash[3]+=5;
            printf("Cash donated\n\n");
            printf("Cash=%i\n\n", player_cash[0]);
            continue;

            case "Go to work":
            player_cash[0]+=10; //Error here
            printf("Work done\n\n");
            printf("Cash=%i\n\n", player_cash[0]);
            continue;

            case "Exit":
            printf("Thanks for playing!\n\n"); //Error here
            break;

            default:
            printf("Does not compute");
            continue;
        }
    }
        getchar();
        return 0;
}

所以，我想要什么，用户需要做的就是类型的选项之一，做到这一点与它对应的动作。我该如何解决这个问题？

So, what I want the user to do is type in one of the options, and do the action that corresponds with it. How do I fix this?

推荐答案

你的一些情况标签是字符（键入字符与表示' S）。那些是的整型常量。

Some of your case labels are characters (type char, indicated with 's). Those are integer constants.

其他的标签字符串（以表示），其有效类型的为const char * 。< SUP> 1 这些的不的整型常量，不能采用这种方式。

Other labels are string literals (indicated with ") which have an effective type of const char *.¹ Those are not integer constants and can not be used in this way.

¹ 因为他们通常可以使用，如果他们的char * ，但不要试图去改变的历史原因。否则后果不堪设想。

¹ For historical reasons they can often be used as if they were char *, but don't try to change them. Or else.

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