memchr() In C

Purpose Of memchr()

memchr() is one of the inbuilt string function in c programming which is used to find the first occurance of a character chr in a string str of length n.

How memchr() Works

The following diagram clearly illustrate the working principle of memchr() inbuilt string function in C.

In the above diagram memchr() takes 3 parameters, first parameter holds a string str, second parameter holds a character chr to be find in a string str, third parameter holds an integer value to set limitation for a search in string str.

Syntax Of memchr()

• memchr() accepts three parameters
• First parameter is a string, second parameter character and third paramter must be a integer.
• To use memchr() inbuilt string function in C, we need to declare #include<string.h> header file.

memchr(str, chr, n);

C Program - memchr()

Let us work through memchr() function, In the following program we will find the first occurance of a character chr in a string str of length n using memchr() inbuilt string function.

#include <stdio.h>
#include<string.h>
int main()
{
char str[] = "asp.net.";
char chr = '.';
char *res;
res = memchr(str, chr, 4);
printf("%s", res);
return 0;
}

.net.

C Program - Without memchr()

Let us find the first occurance of a chracter chr in a string str of length n without using memchr() inbuilt string function.

#include <stdio.h>
#include<string.h>
int main()
{
char str[] = "asp.net.";
char chr = '.', i, n = 4, j;
for(i=0; str[i] !='\0'; i++ )
{
if(str[i] == chr) {
for(j=i; str[j]!='\0';j++)
printf("%c", str[j]);
break;
}
}
return 0;
}

.net.

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