memchr in C language

The memchr function is one of the String Function, which will find the first occurrence of the character, and returns the pointer to it. This function uses its third argument to restrict the search. In this article we will show you, How to use memchr in C Programming language with example.

C memchr syntax

The basic syntax of the memchr in C Programming language is as shown below.

void *memchr(const void *str, int c, size_t n);

• str: A valid string
• c: The value that you want to want to search inside str
• n: The number of character that you want to search within the search object str.

TIP: You have to include the #include<string.h> header before using this memchr string function.

memchr in C Language Example

The memchr function is used to search within the user specified string. This program will help you to understand the memchr with multiple examples.

/* memchr in C Programming Example */
 
#include <stdio.h> 
#include<string.h>

int main()
{  
   	char str[] = "C Programming Language";
   	char ch = 'L';
   	char *result;
   	char *result2;
   	
   	result = memchr(str, ch, strlen(str));
	
   	printf("\n The Final String From %c = %s", ch, result);
   	
   	result2 = memchr("Tutorial Gateway", 'G', strlen(str));
   	
   	printf("\n The Final String From %c = %s", ch, result2);
   	
   	return 0;
}

OUTPUT

memchr in C Example 2

This program allows the user to enter his/her own string, and the character that they want to look for. Next, it is going to use the memchr function to return the part of a string that starts from use specified character.

/* memchr in C Programming Example */
 
#include <stdio.h> 
#include<string.h>

int main()
{  
   	char str[40];
   	char ch;
   	char *result;
   	
   	printf("\n Please Enter any String  : ");
	gets(str);	
	
	printf("\n Please Enter any Charcater that you want to search for  : ");
	scanf("%c", &ch);
		
   	result = memchr(str, ch, strlen(str));
	
   	printf("\n The Final String From %c = %s", ch, result);
   	
	return 0;
   	
}

OUTPUT

This time we will look for non existing character

Although, the given character exists in a string, it is returning NULL. This is because, we restricted the search to first 5 characters and G does not exists in first five characters.

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