在C中使用fgets和strcmp [英] using fgets and strcmp in C

问题描述

我正在尝试从用户那里获取字符串输入，然后根据他们输入的输入来运行不同的功能.

I'm trying to get a string input from the user and then run different functions depending on the input they've entered.

例如，我问，您最喜欢的水果是什么?"我希望程序根据输入的内容进行注释...我不确定如何执行此操作.这是我到目前为止的内容:

For example, say I asked, "What is your favorite fruit?" and I want the program to comment depending on what they enter...I'm not sure how to do this. Here's what I have so far:

#include <stdio.h>
#include <string.h>

char fruit[100];

main() {
    printf("What is your favorite fruit?\n");
    fgets (fruit, 100, stdin);
    if (strcmp(fruit, "apple")) {
        printf("Watch out for worms!\n");
    }
    else {
        printf("You should have an apple instead.\n");
        }

}

当我运行程序时，无论输入什么，它都不会执行else语句.

When I run the program, no matter what I enter, it never does the else statement.

感谢您的帮助！

推荐答案

请注意代码中的两件事:

Note two things in your code:

1. fgets保留结尾的"\ n".与字符串"apple"进行比较之前，应将水果中关联的字符替换为"\ 0".
2. 当两个字符串相同时，strcmp返回0，因此应根据您的意思更改if子句.(if子句中的fruit和"apple"等效)
3. C main函数的标准用法是 int main(){return 0;}

修改后的代码:

#include <stdio.h>
#include <string.h>

char fruit[100];

int main() {
    printf("What is your favorite fruit?\n");
    fgets (fruit, 100, stdin);
    fruit[strlen(fruit)-1] = '\0';
    if (strcmp(fruit, "apple") == 0) {
        printf("Watch out for worms!\n");
    }
    else {
        printf("You should have an apple instead.\n");
    }
    return 0;
}

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