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介绍一下strncmp(c基础)

strncmp是strcmp的进阶版

链接介绍一下strcmp(c基础)-CSDN博客

作用

比较两个字符串的前n位

格式

#include <string.h>

strncmp (arr1,arr2,n);

工作原理:strcmp函数按照ACII(字符编码顺序)比较两个字符串。它从两个字符串的第一个字符开始逐个比较,直到遇到不同的字符或者到达字符串的末尾(即遇到\0)或比较过n个字符。
如果arr1< arr2(即某次比较arr1的ACII小于arr2的)返回一个
<0的值(一般为-1)
如果arr1= arr2、)返回
0
如果arr1 > arr2(即某次比较arr1的ACII大于arr2的)返回一个>0的值(一般为1)

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

//strcmp比较字符串
//int main()
//{
//
//char arr1[20] = "I am 36";
//char arr2[20] = "I am DRAGON";
//
//int result = 0;
//result = strcmp(arr1, arr2);
//
//if (result < 0)
//printf("arr1 is less than arr2");
//else if (result == 0)
//printf("arr1 is equl to arr2");
//else 
//printf("arr1 is more than arr2");
//
//
//return 0;
//}

//strncmp比较字符串
int main()
{

char arr1[20] = "I am 36";
char arr2[20] = "I am DRAGON";

int result = 0;
result = strncmp(arr1, arr2,5);

if (result < 0)
printf("arr1 is less than arr2");
else if (result == 0)
printf("arr1 is equl to arr2");
else 
printf("arr1 is more than arr2");


return 0;
}

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原文地址:https://blog.csdn.net/lb3636363636/article/details/143865257

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