What is the usage of strncmp function?

The usage of strncmp function is to compare the first n characters of string str1 and str2. It is a string comparison function. The code is [int strcmp(char *str1,char * str2, int n)].

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strncmp Function usage:

Function prototype

int strcmp(char *str1,char * str2，int n)

Function

Compare the first n characters of string str1 and str2 character.

Header file

#include <string.h>

Return value

Return value: Return integer value: When str1str2, the return value is >0.

Other instructions: None at the moment.

Description

(1) str1: the first string to be compared;

(2) str2: the second string to be compared String;

(3) n: n is the number of characters for the comparison between the specified str1 and str2;

Example:

#include<string.h>
#include<stdio.h>
int main(void)
{
    char *str1="Hello,I am sky2098,I liking programing!";
    char *str2="Hello,I am sky2098,gramk has gone。";
    int n=13; //指定比较前13个字符
    int inttemp;
    inttemp=strncmp(str1,str2,n);   //将字符串比较的返回值保存在int型变量inttemp中
    if(inttemp<0)
    {
        printf("strlen(str1) < strlen(str2)");
    }
    else if(inttemp>0)
        {
            printf("strlen(str1) > strlen(str2)");
        }
        else
        {
            printf("strlen(str1) == strlen(str2)");
        }
    return 0;
}

#include<string.h>
#include<stdio.h>
int main(void)
{
    char *str1="Hello,I am sky2098,I liking programing!";
    char *str2="Hello,I am sky2098,gramk has gone。";
    int n=strlen(str2);
    int inttemp;
    inttemp=strncmp(str1,str2,n);   //将字符串比较的返回值保存在int型变量inttemp中
    if(inttemp<0)
    {
        printf("strlen(str1) < strlen(str2)");
    }
    else if(inttemp>0)
        {
            printf("strlen(str1) > strlen(str2)");
        }
        else
        {
            printf("strlen(str1) == strlen(str2)");
        }
    return 0;
}

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