Strlen Function

Synopsis:
#include <stdio.h>
int strlen(char *src );
Description:
The strlen function calculates the length, in bytes, of src. This calculation does not include the null terminating character.
Return Value
The strlen function returns the length of src.
Example
#include <stdio.h>
int main()
{
  char string1[20];
  char string2[20];
  strcpy(string1, "Hello");
  strcpy(string2, "Hellooo");
  printf("Length of string1 : %d\n", strlen( string1 ));
  printf("Length of string2 : %d\n", strlen( string2 ));
  return 0;
}
It will proiduce following result:
Length of string1 : 5
Length of string2 : 7