#include <windows.h>
#include <time.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>

LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

char szClassName[ ] = "WindowsApp";
HWND hwnd;
HWND number_1;
HWND number_2;
HWND result;
HWND lab_1;
int WINAPI WinMain (HINSTANCE hThisInstance,
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