print_mem.rs

macro_rules! print_mem {
    ($ptr:expr, $address:expr) => {
        unsafe {
            let a_ptr: *const u32 = &$ptr;
            let b_ptr: *const u8 = a_ptr as *const u8;
            println!("{:#0x}", *b_ptr.offset($address));
        }
    };
}

fn main() {
    let i: u32 = 0b10000000_11000000_11100000_11110000;
    println!("{:#0x}", i);
    print_mem!(i, 0);
    print_mem!(i, 1);
    print_mem!(i, 2);
    print_mem!(i, 3);
}