Dados do monitor(Largura(x) e Altura(y))

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

void janela(void) {
    int cxScreen, cyScreen;
    cxScreen = GetSystemMetrics(0);
    cyScreen = GetSystemMetrics(1);
    printf("\n\nLargura: %d\n", cxScreen);
    printf("\nAltura: %d\n", cyScreen);
}
void main(void) {
    system("title Largura e Altura");
    janela();
}