如何正确使用C比较字符串？ [英] How do I properly compare strings in C?

问题描述

我试图让一个程序让用户输入一个单词或字符，储存，然后再次打印，直到用户键入，退出程序。我的code是这样的：

I am trying to get a program to let a user enter a word or character, store it, and then print it until the user types it again, exiting the program. My code looks like this:

#include <stdio.h>

int main()
{
    char input[40];
    char check[40];
    int i=0;
    printf("Hello!\nPlease enter a word or character:\n");
    gets(input);
    printf("I will now repeat this until you type it back to me.\n");

    while (check != input)
    {
        printf("%s\n", input);
        gets(check); 
    }

    printf("Good bye!");


    return 0;
}

问题是，我不断收到输入字符串的打印，即使用户（检查）输入原始（输入）相匹配。我在比较这两个错误？

The problem is that I keep getting the printing of the input string, even when the input by the user (check) matches the original (input). Am I comparing the two incorrectly?

推荐答案

您不能（有效）比较使用字符串！= 或 = = ，你需要使用 STRCMP ：

You can't (usefully) compare strings using != or ==, you need to use strcmp:

while (strcmp(check,input) != 0)

这样做的原因是因为！= 和 == 将只比较这些字符串的基址。串的不是内容本身

The reason for this is because != and == will only compare the base addresses of those strings. Not the contents of the strings themselves.

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