C語(yǔ)言中的strncmp函數(shù)是用來(lái)比較兩個(gè)字符串的前n個(gè)字符是否相等的函數(shù)。它的聲明如下:
int strncmp(const char* str1, const char* str2, size_t n);
參數(shù)說(shuō)明:
返回值:
需要注意的是,比較的字符數(shù)n應(yīng)該小于等于兩個(gè)字符串的長(zhǎng)度,否則可能會(huì)出現(xiàn)越界錯(cuò)誤。
以下是一個(gè)使用strncmp函數(shù)的示例:
#include <stdio.h>
#include <string.h>
int main() {
char str1[] = "Hello";
char str2[] = "Hel";
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("str1 is less than str2.\n");
} else {
printf("str1 is greater than str2.\n");
}
return 0;
}
輸出結(jié)果為:
The first 3 characters of str1 and str2 are the same.