/*  hexdemo.c  by M. Hazen 
    CSE374 datatype demo
*/

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>

int main(){
	
  int anint;
  float afloat;
  char achar;

  // some initial values:
  anint = 234;
  afloat = 234.432;
  achar = 'A';  // aka, ascii code 65
  
  printf ("int: %d, float: %f, char: %c\n", anint, afloat, achar); 

  printf ("Cast to int.\n");
  printf ("int: %d, float: %d, char: %d\n", anint, (int)afloat, (int)achar); 

  printf ("Cast to float.\n");
  printf ("int: %f, float: %f, char: %f\n", (float)anint, afloat, (float)achar); 

  printf ("Cast to char.\n");
  anint=66;
  afloat = 67.76;
  printf ("int: %c, float: %c, char: %c\n", (char)anint, (char)afloat, achar); 

  // hexadecimal stuff:
  anint = 0xEA;
  unsigned int auint = 0xEB;
  unsigned char auchar = 0xEC;
  
  printf ("Hex values: \n");
  printf ("float: %X, char: %X \n", (int)afloat, (int)achar);
  printf ("int: %x, uint: %x, uchar: %x\n", anint, auint, auchar);
  printf ("Hex values as ints: \n");
  printf ("int: %d, uint: %d, uchar: %d\n", anint, auint, auchar);

  // scanf examples
  printf("Enter value in hexadecimal: ");
  scanf("%x", &auint);
  printf("a in hex: %X, and in decimal: %d\n", auint, auint);

  uintptr_t mymem = (uintptr_t) malloc (16);
  
  for (int i = 0; i < 16; i++) {
    *((unsigned char*)(mymem+i)) = 0xFE;
  }

  // ret = (uintptr_t) buffer1 + 21; 

  //treat that number like a pointer, and change the value in it
  //*((uintptr_t*)ret) += 7;

  for (int i = 0; i < 16; i++) {
    printf ("%x ", *((unsigned char*)(mymem+i)));
  }
  return 0;
}