Use the associated .cpp file to execute the assignment. Write assembler code to

Question

Use the associated .cpp file to execute the assignment.

Write assembler code to put the values of byte1, byte2, byte3, and byte4 into the C++ memory variable resultUInt32. The bytes have to be in the following order when resultUInt32 is displayed in hex by the C++ part of the program: 11223344

#include "stdafx.h"

#include <iostream>

#include <cstdint>

using namespace std;

void main() {

const uint8_t byte1(0x11), byte2(0x22), byte3(0x33), byte4(0x44);

uint32_t resultUInt32(0);

_asm {

mov ah, byte1

mov al, byte2

shl eax, 16

mov ah, byte3

mov al, byte4

mov resultUInt32, eax

}

cout << "The result is " << hex << resultUInt32 << endl;

}

Explanation / Answer

I have marked the changes in bold, and the solution is quite clear. Please let me know if you still want some explanation.

#include "stdafx.h"
#include <iostream>
#include <cstdint>

using namespace std;

void main() {
//const uint8_t byte1(0x11), byte2(0x22), byte3(0x33), byte4(0x44);
const uint8_t byte1 = 0x11, byte2 = 0x22, byte3 = 0x33, byte4 = 0x44;
//uint32_t resultUInt32(0);
uint32_t resultUInt32 = 0;

_asm {
mov eax,byte1
shl eax 8
OR eax byte2
shl eax 8
OR eax byte3
shl eax 8
OR eax byte4
mov resultUInt32, eax
};

cout << "The result is " << hex << resultUInt32 << endl;

}

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