C/C++ • How to change resolution of display via c++ ?

Code:

std::system("wlr-randr --output HDMI-A-1 --mode 640x480");glutInit(&argc, argv);glutInitWindowSize( 640, 480);glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);glutCreateWindow("Example");glutDisplayFunc( render );glutIdleFunc( update );glutKeyboardFunc(on_key_events);glutFullScreen();