strncmp string function in C programming language

Karmehavannan

8 years ago

strncmp string function in C programming language

In this tutorial, We will learn about strncmp string function in C programming language

Description

strncmp() – In the c programming language, the strncmp() function returns a negative , Zero and positive integer depending on whether the first n character of the object pointed by str1 is less than, equal to, or greater than the first n character of the object pointed to by str2.(compare str1 and str2)

Declaration

The syntax for strncmp() function is given below, in C Language is:

int strncmp(const char *str1, const char *str2,size of n);

Parameters

str1 – this is the first string to be compared

str2 – this is the second string to be compared

n- the maximum number of character to be compared

Returns

the strncmp function returns an integer value as follows

when strncmp() returns value<0 then it denotes str1 is less than str2

when strncmp() returns value>0 then it denotes str1 is grater than than str2

when strncmp() returns value=0 then it denotes str1 is equal to str2

Required Header

the required header for strncmp() String function in C Programming language

#include<string.h>

strncmp string function

Example

Program 1

If both strings are same

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

int main()
{
    char str1[]="Hello";
    char str2[]="Hello";
    int check=strncmp(str1,str2,4);
    if(check<0){
        printf("str1 is less than to str2\n");
    }
    else if(check>0){
        printf("str1 is greater than to str2\n");
    }
    else{
        printf("str1 is equal to str2\n");
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results:

str1 is equal to str2

If both strings are not the same

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

int main()
{
    char str1[]="Hello";
    char str2[]="hello";
    int check=strncmp(str1,str2,4);
    if(check<0){
        printf("str1 is less than to str2\n");
    }
    else if(check>0){
        printf("str1 is greater than to str2\n");
    }
    else{
        printf("str1 is equal to str2\n");
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results:

str1 is less than to str2

There are other C programming language functions that are similar to this function

strcat() function in C language

strcpy() function in C language

strncpy() function in C language

strset() function in C language

strlwr() function in C language

strdub() function in C language

strupr() function in C language

strlen() function in C language

strnset() function in C language