Cpp1.cpp(4) : error C2447: missing function header (old-style formal list?)

#include <stdio.h>
#include <conio.h>
#include <windows.h>
{int a;
printf("Da a: ");
scanf("%d",&a);
if(a != 9) {
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
    LPSTR lpCmdLine, int nCmdShow)
{
MessageBox(NULL, "La revedere!", "Note", MB_OK);
    return 0;
}
} else { 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
    LPSTR lpCmdLine, int nCmdShow)
{
MessageBox(NULL, "La revedere!2", "Note", MB_OK);
    return 0;
}
}
system("pause");
}