程序代码：

int huge ReturnMode() {
    return 3;
}

int main() {
    
    int GDriver = DETECT, GMode;
    installuserdriver("Svga64k",ReturnMode); 
    initgraph(&GDriver, &GMode, "");
    setcolor(65530);
    line(0,0,600,400);
    
    getchar();
    closegraph();
    return 0;
}