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You have to include windows.h header. Here is an working example.

#include
#include
#include

int main() {

DEVMODE devmode;
devmode.dmPelsWidth = 1024;
devmode.dmPelsHeight = 768;
devmode.dmFields = DM\_PELSWIDTH | DM\_PELSHEIGHT;
devmode.dmSize = sizeof(DEVMODE);

long result = ChangeDisplaySettings(&devmode, 0);

return 0;

}