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

void main(void)
{
    DEVMODE dmDetails;
    DWORD dwModeIndex;
    for (dwModeIndex = 0; ;dwModeIndex++)
    {
        dmDetails.dmSize = sizeof(dmDetails);
        if (EnumDisplaySettings(NULL, dwModeIndex, &dmDetails) == FALSE)
            break;
        printf("%lu x %lu x %lu bits, flags=%lu, freq=%lu\n", 
            dmDetails.dmPelsWidth, dmDetails.dmPelsHeight, dmDetails.dmBitsPerPel, 
            dmDetails.dmDisplayFlags, dmDetails.dmDisplayFrequency);
    }
}