strlen Function

Finds the length of a string.

Include

<string.h>

Prototype

size_t strlen(const char *s);

Argument

s

the string

Return Value

Returns the length of a string.

Remarks

This function determines the length of the string, not including the terminating null character.

Example

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

int main(void)
{
  char str1[20] = "We are here";
  char str2[20] = "";
  char str3[20] = "Why me?";

  printf("str1 : %s\n", str1);
  printf("\t(string length = %d characters)\n\n",
         strlen(str1));
  printf("str2 : %s\n", str2);
  printf("\t(string length = %d characters)\n\n",
         strlen(str2));
  printf("str3 : %s\n", str3);
  printf("\t(string length = %d characters)\n\n\n",
         strlen(str3));

}

Example Output

str1 : We are here
        (string length = 11 characters)

str2 :
        (string length = 0 characters)

str3 : Why me?
        (string length = 7 characters)