C library function - strlen()

Description

The C library function size_t strlen(const char *str) computes the length of the string str up to but not including the terminating null character.

Declaration

Following is the declaration for strlen() function.

size_t strlen(const char *str)

Parameters

• str -- This is the string whose length is to be found.

Return Value

This function returns the length of string.

Example

The following example shows the usage of strlen() function.

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

int main ()
{
   char str[50];
   int len;

   strcpy(str, "This is tutorialspoint.com");

   len = strlen(str);
   printf("Length of |%s| is |%d|\n", str, len);
   
   return(0);
}

Let us compile and run the above program, this will produce the following result:

Length of |This is tutorialspoint.com| is |26|