// pointers.c
// Author: Chris Wilcox
// Date:   9/23/2014
// Class:  CS270
// Email:  wilcox@cs.colostate.edu

// Include files
#include <math.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    union {
        float f;
        int i;
    } either;

    float myFloat = 1.5f;
    int myInteger = 15;

    // Straightforward printing
    printf("myInteger (as integer)= %d\n", myInteger);
    printf("myFloat (as float) = %.2f\n", myFloat);

    // Type conversion
    printf("myInteger (as float) = %.2f\n", (float)myInteger);
    printf("myFloat (as integer) = %d\n", (int)myFloat);

    // Pointers
    printf("myInteger (int pointer) = %p\n", &myInteger);
    printf("myFloat (float pointer) = %p\n", &myFloat);
    printf("myInteger (deref int pointer)= %d\n", *(&myInteger));
    printf("myFloat (deref float pointer) = %.2f\n", *(&myFloat));

    // Hexadecimal value
    printf("myInteger (hex value) = %#x\n", myInteger);
    printf("myFloat (hex value) = %#x (bad!)\n", myFloat);

    // Pointer misdirection
    printf("myFloat (hex value) = %#x (good!)\n", *(int *)&myFloat);

    // Union method
    either.f = 1.5;
    printf("union (as float) = %.2f\n", either.f);
    printf("union (as integer) = %#x\n", either.i);
    either.i = 0x40000000;
    printf("union (as float) = %.2f\n", either.f);
    printf("union (as integer) = %#x\n", either.i);

    // static allocation for array
    int iArray[2] = {1234, 5678};
    printf("iArray[0]: %d\n", iArray[0]);
    printf("iArray[1]: %d\n", iArray[1]);
    printf("&iArray[0]: %p\n", &iArray[0]);
    printf("&iArray[1]: %p\n", &iArray[1]);
    printf("iArray: %p\n", iArray);

    return 0;
}