Array size in C

/*
 find the size of a char array in two ways
*/

#include <stdio.h>

unsigned int strsize(char* str) {
  unsigned int s = sizeof(str) / sizeof(str[0]);
  return s;
}

int main(void) {
  char str [5] = "abcde";
  // inline
  int size1 = sizeof(str) / sizeof(str[0]);
  // function call
  int size2 = strsize(str);

  printf("* size: expected  %d\n", 5);
  printf("  inline)         %d\n", size1);
  printf("  function call)  %d\n", size2);
  return 0;
}

// compile>>> gcc -o strsize.out strsize.c