1 files changed, 59 insertions, 0 deletions
diff --git a/projects/12/Keyboard.jack b/projects/12/Keyboard.jack
index 03e1031..ceb3438 100644
--- a/projects/12/Keyboard.jack
+++ b/projects/12/Keyboard.jack
@@ -10,6 +10,7 @@ class Keyboard {
 
     /** Initializes the keyboard. */
     function void init() {
+        return;
     } 
 
     /**
@@ -33,6 +34,7 @@ class Keyboard {
      * F1 - F12 = 141 - 152
      */
     function char keyPressed() {
+        return Memory.peek(24576);
     }
 
     /**								
@@ -41,6 +43,17 @@ class Keyboard {
      * of the pressed key.
      */
     function char readChar() {
+        var int key, key1;
+        let key = 0;
+        while (key = 0) {
+            key = Memory.peek(24576);
+        }
+        key1 = key;
+        while (key1 = key) {
+            key1 = Memory.peek(24576);
+        }
+        Output.printChar(key);
+        return key;
     }
 
     /**								
@@ -49,6 +62,22 @@ class Keyboard {
      * and returns its value. Also handles user backspaces.
      */
     function String readLine(String message) {
+        var int c;
+        var String s;
+        let s = "";
+        Output.printString(message);
+        let c = Keyboard.readChar();
+        while (~(c = 128)) {
+            if (c = 129) {
+                if (s.length() > 0) {
+                    do s.eraseLastChar();
+                }
+            } else {
+                do s.appendChar(c);
+            }
+            let c = Keyboard.readChar();
+        }
+        return s;
     }   
 
     /**								
@@ -58,5 +87,35 @@ class Keyboard {
      * entered text is detected). Also handles user backspaces. 
      */
     function int readInt(String message) {
+        var int n, i;
+        var char t;
+        var String s;
+        let n = 0;
+        let neg = false;
+        let s = Keyboard.readLine("");
+        let i = 0;
+        if (s.charAt(0) = 45) {
+            let i = 1;
+            let neg = true;
+        }
+        let t = s.charAt(i);
+        if ((t < 48) | (t > 57)) {
+            do Sys.error(3);
+            Output.printString("Keyboard.readInt: the input data is not number!");
+        }
+        let done = false;
+        while (~done) {
+            if ((s.charAt(i) > 47) & (s.charAt(i) < 58)) {
+                n = n * 10 + (t - 48);
+            } else {
+                done = true;
+            }
+            let i = i + 1;
+            done = done | (i < s.length());
+        }
+        if (neg) {
+            n = - n;
+        }
+        return n;
     }
 }