Help source code hack

#include <windows.h>
#include <stdio.h>

bool wh=false;

void CrazyVladHack()
{
    while(1){
        if(GetAsyncKeyState(VK_INSERT) &1){
            wh= !wh;
        }
        if(wh==true){
            DWORD Addy_ESP = *(DWORD*)0x007440;
            if(Addy_ESP != 0)
                *(float*)(Addy_ESP + 0x007) = 100;
        }
        Sleep(50);
    }
}

BOOL WINAPI DllMain(HINSTANCE module, DWORD dwReason, LPVOID lpvReserved)
{
    if(dwReason == DLL_PROCESS_ATTACH)
    {
        CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)CrazyVladHack, NULL, NULL, NULL);
        MessageBoxA(0, "Inject CrazyVladHACK", "Good!",0);
    }
    return TRUE;
}