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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;
+ }
+}