strncmp用法示例

strncmp函数用于比较两个字符串的前n个字符是否相等。它的函数声明为int strncmp(const char *str1, const char *str2, size_t n)。 示例用法如下：

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

int main() {
    char str1[] = "Hello";
    char str2[] = "Help";
    int result = strncmp(str1, str2, 3);
    
    if (result == 0) {
        printf("The first 3 characters of str1 and str2 are the same.\n");
    } else if (result < 0) {
        printf("The first 3 characters of str1 are less than str2.\n");
    } else {
        printf("The first 3 characters of str1 are greater than str2.\n");
    }
    
    return 0;
}

在这个示例中，我们比较了字符串"Hello"和"Help"的前3个字符。由于两个字符串的前3个字符都是"H", "e", "l"，因此它们是相等的。结果会打印出"The first 3 characters of str1 and str2 are the same."。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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