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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/KeyboardTest/Main.jack
/** Test program for the OS Keyboard class. */
class Main {
/** Gets input from the user and verifies its contents. */
function void main() {
var char c, key;
var String s;
var int i;
var boolean ok;
let ok = false;
do Output.printString("keyPressed test:");
do Output.println();
while (~ok) {
do Output.printString("Please press the 'Page Down' key");
while (key = 0) {
let key = Keyboard.keyPressed();
}
let c = key;
while (~(key = 0)) {
let key = Keyboard.keyPressed();
}
do Output.println();
if (c = 137) {
do Output.printString("ok");
do Output.println();
let ok = true;
}
}
let ok = false;
do Output.printString("readChar test:");
do Output.println();
do Output.printString("(Verify that the pressed character is echoed to the screen)");
do Output.println();
while (~ok) {
do Output.printString("Please press the number '3': ");
let c = Keyboard.readChar();
do Output.println();
if (c = 51) {
do Output.printString("ok");
do Output.println();
let ok = true;
}
}
let ok = false;
do Output.printString("readLine test:");
do Output.println();
do Output.printString("(Verify echo and usage of 'backspace')");
do Output.println();
while (~ok) {
let s = Keyboard.readLine("Please type 'JACK' and press enter: ");
if (s.length() = 4) {
if ((s.charAt(0) = 74) & (s.charAt(1) = 65) & (s.charAt(2) = 67) & (s.charAt(3) = 75)) {
do Output.printString("ok");
do Output.println();
let ok = true;
}
}
}
let ok = false;
do Output.printString("readInt test:");
do Output.println();
do Output.printString("(Verify echo and usage of 'backspace')");
do Output.println();
while (~ok) {
let i = Keyboard.readInt("Please type '-32123' and press enter: ");
if (i = (-32123)) {
do Output.printString("ok");
do Output.println();
let ok = true;
}
}
do Output.println();
do Output.printString("Test completed successfully");
return;
}
}
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