// file: my first program
//
#include <stdio.h>
#include <math.h>
#include <string.h>

// my main program starts here
//
int main(int argc, char** argv) {

  char chr = 'a';
  char chr2 = 'b';

  fprintf(stdout, "the address of chr is %p (%lu)\n", &chr, &chr);
  fprintf(stdout, "the value of chr is %c\n", chr);
  
  fprintf(stdout, "the address of chr2 is %p (%lu)\n", &chr2, &chr2);
  fprintf(stdout, "the value of chr2 is %c\n", chr2);

  char str[] = "Joe";
  fprintf(stdout, "the address of str is %p (%lu)\n", str, str);
  fprintf(stdout, "the value of str[0] is %c (%c)\n", str[0], *str);
  fprintf(stdout, "the value of str is %s\n", str);
  
  float sum = 27.0;
  fprintf(stdout, "the value of sum is %f (%f)\n", sum, *(&sum));  

  char* pstr = str;
  for (long i=0; i<4; i++) {
    fprintf(stdout, "addr of pstr = %lu (%c)\n", pstr, *pstr);
    pstr++;
  }

  // exit gracefully
  //
  return 0;
}