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// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/12/SysTest/Main.jack
/** Test program for the OS Sys class. */
class Main {
/** Tests the wait method of the Sys class. */
function void main() {
var char key;
do Output.printString("Wait test:");
do Output.println();
do Output.printString("Press any key. After 2 seconds, another message will be printed:");
while (key = 0) {
let key = Keyboard.keyPressed();
}
while (~(key = 0)) {
let key = Keyboard.keyPressed();
}
do Sys.wait(2000);
do Output.println();
do Output.printString("Time is up. Make sure that 2 seconds elapsed.");
return;
}
}
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