/* show_bytes.c
 * For use in CSE351 Lec 3 on Memory, Data, and Addressing
 */


// needed for library function printf()
#include <stdio.h>


/* Normally you would put function prototypes here:

  void show_bytes(char *start, int len);
  void show_int(int x);

  Except that in this case the function declarations
  come before their first calls in the file, so they
  are not necessary.
*/


/* Takes start address of data and prints out len bytes in hex.  */
void show_bytes(char *start, int len) {
  int i;
  // for loop doesn't need curly braces {} because single-line body
  for (i = 0; i < len; i++)
    // printf symbols:
    //  %p - print as pointer
    //  \t - tab character
    //  %x - print in hex (.2 means pad to 2 digits)
    //  \n - newline character
    printf("%p\t0x%.2hhX\n", start+i, *(start+i));
  printf("\n");
}


/* Uses show_bytes() to print hex representation of integer.
   Use of sizeof() means this code will work even if int isn't 4B. */
void show_int(int x) {
  show_bytes((char *) &x, sizeof(int));
}


/* Example usage of show_int(). */
int main() {
  int x = 123456;  // 123456 = 0x1E240
  printf("int x = %d;\n", x);
  show_int(x);

  return 0;
}