#include <stdio.h>

int slength(char s[])
{  int i;
   i =0;
   while(s[i]!='\0')
    i = i+1;
   return i;
}

main(int argc,char ** argv)
{  char * q;
   q = "how long is this string?";
   printf("%s: %d characters\n",q,slength(q));
}