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

int string_length_v2(char* str) {
  // while loop version with pointers
  int len = 0;
  while (*str) {
    str++;
    len++;
  }
  return len;
}

int string_length_v3(char* str) {
  // no-counter for loop version
  char* s;
  for (s = str; *s; s++) {}
  // pointer arithmetic!
  return s - str;
}

int string_length_v1(char str[]) {
  // array version
  int len;
  for (len = 0; str[len]; len++) {}
  return len;
}


int main() {

  char mystr[] = "Hello";
  size_t len = string_length_v3(mystr);

  printf("String: %s\n", mystr);
  printf("Length: %zu\n", len);
  printf("Values: %d %d %d %d %d %d\n",
      mystr[0], mystr[1], mystr[2], mystr[3], mystr[4], mystr[5]);

  return 0;
}