.

projects/12/KeyboardTest/Keyboard.jack

@@ -0,0 +1,101 @@
+// 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/Keyboard.jack
+
+/**
+ * A library for handling user input from the keyboard.
+ */
+
+class Keyboard {
+    static Array mem;
+    /** Initializes the keyboard. */
+    function void init() {
+        let mem = 0;
+        return;
+    } 
+
+    /**
+     * Returns the character of the currently pressed key on the keyboard;
+     * if no key is currently pressed, returns 0.
+     *
+     * Recognizes all ASCII characters, as well as the following keys:
+     * new line = 128 = String.newline()
+     * backspace = 129 = String.backspace()
+     * left arrow = 130
+     * up arrow = 131
+     * right arrow = 132
+     * down arrow = 133
+     * home = 134
+     * End = 135
+     * page up = 136
+     * page down = 137
+     * insert = 138
+     * delete = 139
+     * ESC = 140
+     * F1 - F12 = 141 - 152
+     */
+    function char keyPressed() {
+        return mem[24576];
+    }
+
+    /**								
+     * Waits until a key is pressed on the keyboard and released,
+     * then echoes the key to the screen, and returns the character 
+     * of the pressed key.
+     */
+    function char readChar() {
+        var char a, b;
+        do Output.printChar(0);
+        while ((b = 0) | (a > 0)){
+            let a = Keyboard.keyPressed();
+            if (a > 0){
+                let b = a;
+            }
+        }
+        do Output.printChar(String.backSpace());
+        do Output.printChar(b);
+        return b;
+    }
+
+    /**								
+     * Displays the message on the screen, reads from the keyboard the entered
+     * text until a newline character is detected, echoes the text to the screen,
+     * and returns its value. Also handles user backspaces.
+     */
+    function String readLine(String message) {
+        var String s, b;
+        var char c;
+        let s = String.new(100);
+        do Output.printString(message);
+        while (true){
+            let c = Keyboard.readChar();
+            if (c = 128){
+                return s;
+            }
+            else{
+                if (c = 129){
+                    do s.eraseLastChar();
+                }
+                else{
+                    do s.appendChar(c);
+                }
+            }
+        }
+    }   
+
+    /**								
+     * Displays the message on the screen, reads from the keyboard the entered
+     * text until a newline character is detected, echoes the text to the screen,
+     * and returns its integer value (until the first non-digit character in the
+     * entered text is detected). Also handles user backspaces. 
+     */
+    function int readInt(String message) {
+        var starting a;
+        var int b;
+        let a = Main.readLine_stolen(message);
+        let b = String.intValue(a);
+        do String.dispose(a);
+        return b;
+    }
+}

projects/12/KeyboardTest/Keyboard.vm

@@ -0,0 +1,156 @@
+function Keyboard.init 0
+push constant 0
+pop static 0
+push constant 0
+return
+function Keyboard.keyPressed 0
+push static 0
+push constant 24576
+add
+pop pointer 1
+push that 0
+return
+function Keyboard.readChar 2
+push constant 0
+call Output.printChar 1
+pop temp 0
+label L0
+push local 1
+push constant 0
+eq
+push local 0
+push constant 0
+gt
+or
+not
+if-goto L1
+call Keyboard.keyPressed 0
+pop local 0
+push local 0
+push constant 0
+gt
+not
+if-goto L2
+push local 0
+pop local 1
+goto L3
+label L2
+label L3
+goto L0
+label L1
+call String.backSpace 0
+call Output.printChar 1
+pop temp 0
+push local 1
+call Output.printChar 1
+pop temp 0
+push local 1
+return
+function Keyboard.readLine 3
+push constant 100
+call String.new 1
+pop local 0
+push argument 0
+call Output.printString 1
+pop temp 0
+label L4
+push constant 1
+neg
+not
+if-goto L5
+call Keyboard.readChar 0
+pop local 2
+push local 2
+push constant 128
+eq
+not
+if-goto L6
+push local 0
+return
+goto L7
+label L6
+push local 2
+push constant 129
+eq
+not
+if-goto L8
+push local 0
+call String.eraseLastChar 1
+pop temp 0
+goto L9
+label L8
+push local 0
+push local 2
+call String.appendChar 2
+pop temp 0
+label L9
+label L7
+goto L4
+label L5
+function Keyboard.readInt 2
+push constant 100
+call String.new 1
+pop local 0
+push argument 0
+call Output.printString 1
+pop temp 0
+label L10
+push constant 1
+neg
+not
+if-goto L11
+push local 1
+call Keyboard.readChar 1
+pop local 1
+push local 1
+push constant 128
+eq
+not
+if-goto L12
+push local 0
+call String.intValue 1
+return
+goto L13
+label L12
+push local 1
+push constant 129
+eq
+not
+if-goto L14
+push local 0
+call String.eraseLastChar 1
+pop temp 0
+goto L15
+label L14
+push local 1
+push constant 47
+gt
+push local 1
+push constant 57
+lt
+and
+not
+if-goto L16
+push local 0
+push local 1
+call String.appendChar 2
+pop temp 0
+goto L17
+label L16
+label L17
+push local 1
+push constant 45
+eq
+not
+if-goto L18
+push local 0
+push local 1
+call String.appendChar 2
+pop temp 0
+goto L19
+label L18
+label L19
+label L15
+label L13
+goto L10
+label L11

projects/12/KeyboardTest/Main.jack

@@ -0,0 +1,93 @@
+// 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;
+    }
+}

projects/12/KeyboardTest/Main.vm

@@ -0,0 +1,954 @@
+function Main.main 5
+push constant 0
+pop local 4
+push constant 16
+call String.new 1
+push constant 107
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+push constant 80
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+label L0
+push local 4
+not
+not
+if-goto L1
+push constant 32
+call String.new 1
+push constant 80
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 80
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 103
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 68
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 119
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+label L2
+push local 1
+push constant 0
+eq
+not
+if-goto L3
+call Keyboard.keyPressed 0
+pop local 1
+goto L2
+label L3
+push local 1
+pop local 0
+label L4
+push local 1
+push constant 0
+eq
+not
+not
+if-goto L5
+call Keyboard.keyPressed 0
+pop local 1
+goto L4
+label L5
+call Output.println 0
+pop temp 0
+push local 0
+push constant 137
+eq
+not
+if-goto L6
+push constant 2
+call String.new 1
+push constant 111
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 1
+neg
+pop local 4
+goto L7
+label L6
+label L7
+goto L0
+label L1
+push constant 0
+pop local 4
+push constant 14
+call String.new 1
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 67
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 59
+call String.new 1
+push constant 40
+call String.appendChar 2
+push constant 86
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 102
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 41
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+label L8
+push local 4
+not
+not
+if-goto L9
+push constant 29
+call String.new 1
+push constant 80
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 117
+call String.appendChar 2
+push constant 109
+call String.appendChar 2
+push constant 98
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 51
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Keyboard.readChar 0
+pop local 0
+call Output.println 0
+pop temp 0
+push local 0
+push constant 51
+eq
+not
+if-goto L10
+push constant 2
+call String.new 1
+push constant 111
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 1
+neg
+pop local 4
+goto L11
+label L10
+label L11
+goto L8
+label L9
+push constant 0
+pop local 4
+push constant 14
+call String.new 1
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 76
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 38
+call String.new 1
+push constant 40
+call String.appendChar 2
+push constant 86
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 102
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 117
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 103
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 102
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 98
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 41
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+label L12
+push local 4
+not
+not
+if-goto L13
+push constant 36
+call String.new 1
+push constant 80
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 74
+call String.appendChar 2
+push constant 65
+call String.appendChar 2
+push constant 67
+call String.appendChar 2
+push constant 75
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+call Keyboard.readLine 1
+pop local 2
+push local 2
+call String.length 1
+push constant 4
+eq
+not
+if-goto L14
+push local 2
+push constant 0
+call String.charAt 2
+push constant 74
+eq
+push local 2
+push constant 1
+call String.charAt 2
+push constant 65
+eq
+and
+push local 2
+push constant 2
+call String.charAt 2
+push constant 67
+eq
+and
+push local 2
+push constant 3
+call String.charAt 2
+push constant 75
+eq
+and
+not
+if-goto L15
+push constant 2
+call String.new 1
+push constant 111
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 1
+neg
+pop local 4
+goto L16
+label L15
+label L16
+goto L17
+label L14
+label L17
+goto L12
+label L13
+push constant 0
+pop local 4
+push constant 13
+call String.new 1
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 73
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 38
+call String.new 1
+push constant 40
+call String.appendChar 2
+push constant 86
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 102
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 117
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 103
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 102
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 98
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 41
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+label L18
+push local 4
+not
+not
+if-goto L19
+push constant 38
+call String.new 1
+push constant 80
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 45
+call String.appendChar 2
+push constant 51
+call String.appendChar 2
+push constant 50
+call String.appendChar 2
+push constant 49
+call String.appendChar 2
+push constant 50
+call String.appendChar 2
+push constant 51
+call String.appendChar 2
+push constant 39
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+call Keyboard.readInt 1
+pop local 3
+push local 3
+push constant 32123
+neg
+eq
+not
+if-goto L20
+push constant 2
+call String.new 1
+push constant 111
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 1
+neg
+pop local 4
+goto L21
+label L20
+label L21
+goto L18
+label L19
+call Output.println 0
+pop temp 0
+push constant 27
+call String.new 1
+push constant 84
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 109
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 117
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 102
+call String.appendChar 2
+push constant 117
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+push constant 0
+return