#include <iostream>
#include <cstdint>
using namespace std;
unsigned char* mem = nullptr;

struct A
{
  double d;
  char c[5];
};

struct B
{
    float f;
    int a;
    char c[2];
    double d;
};

void InitMemory()
{
    mem = new unsigned char[1024];
}

int main() {
    // your code goes here

    InitMemory();

    //512 byte blocks to write structs A and B to, purposefully misaligned
    unsigned char* memoryBlockForStructA = mem + 1;
    unsigned char* memoryBlockForStructB = mem + 512;

    unsigned char* firstAInMemory = (unsigned char*)(uintptr_t(memoryBlockForStructA) + uintptr_t(alignof(A) - 1) & ~uintptr_t(alignof(A) - 1));
    A* firstA = new(firstAInMemory) A();

    A* secondA = new(firstA + 1) A();
    A* thirdA = new(firstA + 2) A();

    cout << "Alignment of A Block: " << endl;
    cout << "Memory Start: " << (void*)&(*memoryBlockForStructA) << endl;
    cout << "Starting Address of firstA:  " << (void*)&(*firstA) << endl;
    cout << "Starting Address of secondA: " << (void*)&(*secondA) << endl;
    cout << "Starting Address of thirdA: " << (void*)&(*thirdA) << endl;
    cout << "Sizeof(A): " << sizeof(A) << endl << "Alignof(A): " << alignof(A) << endl;
    return 0;
}

Alignment of A Block:
Memory Start: 0x563fe1239c21
Starting Address of firstA:  0x563fe1239c28
Starting Address of secondA: 0x563fe1239c38
Starting Address of thirdA: 0x563fe1239c48
Sizeof(A): 16
Alignof(A): 8