#include <windows.h>

#include <stdio.h>

#include <conio.h>

void main()

{

    DEVMODE devmode,oldmode;

    EnumDisplaySettings(NULL,ENUM_CURRENT_SETTINGS,&devmode);

    ZeroMemory(&oldmode,sizeof(DEVMODE));

    CopyMemory(&oldmode,&devmode,sizeof(DEVMODE));

    printf("BitsPerPel:%d\n",devmode.dmBitsPerPel);

    printf("DisplayFrequency:%d\n",devmode.dmDisplayFrequency);

    printf("PelsWidth:%d\n",devmode.dmPelsWidth);

    printf("PelsHeight:%d\n",devmode.dmPelsHeight);

    printf("Press any key to change display...\n");

    getch();

    printf("BitsPerPel:%d\n",devmode.dmBitsPerPel=16);

    printf("DisplayFrequency:%d\n",devmode.dmDisplayFrequency=60);

    printf("PelsWidth:%d\n",devmode.dmPelsWidth=800);

    printf("PelsHeight:%d\n",devmode.dmPelsHeight=600);

    ChangeDisplaySettings(&devmode,0);

    printf("Press any key to restore...\n");   

    getch();

    printf("BitsPerPel:%d\n",oldmode.dmBitsPerPel);

    printf("DisplayFrequency:%d\n",oldmode.dmDisplayFrequency);

    printf("PelsWidth:%d\n",oldmode.dmPelsWidth);

    printf("PelsHeight:%d\n",oldmode.dmPelsHeight);

    printf("Press any key to change display...\n");

    ChangeDisplaySettings(&oldmode,0);

    getch();

}