====== strlen ======
<code c>
size_t strlen(const char *str);
</code>
calculates the size of a char array\\
    
===== C Sourcecode Example =====
<code c>
#include <stdio.h>
#include <string.h>
  
int main (void) 
{

  char ss[20] = "hello world";
  int length = strlen(ss);
  int i;
  
  printf ("strlen is %i\n", length);
  
  for ( i = 0; i < length ; ++ i )
    printf ("iam at char count %i\n", i);
  
  return 0;    
}
</code>


    ===== output =====
    strlen is 11
    iam at char count 0
    iam at char count 1
    iam at char count 2
    iam at char count 3
    ...
    iam at char count 10