/* 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%.2x\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 = 12345;		// 12345 = 0x3039
	printf("int x = 12345;\n");
	show_int(x);

	return 0;
}