Binary conversion

[COLOR=#000000][FONT=verdana]Im having a problem with this code to convert decimal to binary ive got the formula but it wont print to the screen_txt only on the console and also my calculator wont let me change any other number other than 3 so if i press 7 binary should be 111 but it stays 11…[/FONT][/COLOR]

[COLOR=#000000][FONT=verdana]var num: Number;[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]var inputVal:Number;[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]var calculatedVal:Number;[/FONT][/COLOR]

[COLOR=#000000][FONT=verdana]binary_btn.addEventListener(MouseEvent.CLICK, binaryBtn);[/FONT][/COLOR]

[COLOR=#000000][FONT=verdana]function binaryBtn(event:MouseEvent) : void [/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]{[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]inputVal = Number(screen_txt.text);[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]var num:Number = parseInt (, 10);[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]trace (num.toString(2));[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]trace(inputVal);[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]calculatedVal = Number(num);[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]screen_txt.text = calculatedVal.toString();[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]}[/FONT][/COLOR]