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#include <iostream>
using namespace std;
 
int main() {
	keybd_event('A', 0, KEYEVENTF_KEYDOWN, 0);
	keybd_event('A', 0, KEYEVENTF_KEYUP, 0);
}

prog.cpp: In function 'int main()':
prog.cpp:5:22: error: 'KEYEVENTF_KEYDOWN' was not declared in this scope
  keybd_event('A', 0, KEYEVENTF_KEYDOWN, 0);
                      ^
prog.cpp:5:42: error: 'keybd_event' was not declared in this scope
  keybd_event('A', 0, KEYEVENTF_KEYDOWN, 0);
                                          ^
prog.cpp:6:22: error: 'KEYEVENTF_KEYUP' was not declared in this scope
  keybd_event('A', 0, KEYEVENTF_KEYUP, 0);
                      ^

Standard output is empty