Thread: Java Calculator

Hi every one i just started my java class.Its been a week since the class and since i have some programming knowlage with C it want a big deal to creat it ..All my friends were impresed coz we havent even started AWT programming (win API) and i just made this here is the code ...Save it as
Calculator.java
if u have java compiler installed goto your command prompt and type javac Calculator.java
then java Calculator

Code:

/*Calculator in java*/
import java.awt.*;
import java.util.*;
import java.awt.event.*;

public class Calculator extends Frame implements ActionListener
{
	public Button btn[];
	public String numstr[] = {"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+","CE"};
	public TextField tf = new TextField();
	Panel  p2 = new Panel (new GridLayout(5,4,2,2));
	String st, store ;
	String str[] = new String[3];
	String storestr;
	float num[] = new float[2]; 
       	int sum;
	int cnt=0;
	StringTokenizer Tok;
	
	public Calculator()
	{
		super("Calculator");
		st = new String();
		add("North",tf);
		add("Center",p2);
		p2.setBackground(Color.gray);                                                                              
		                                                                                                        
		btn = new Button[numstr.length];
		for ( int i=0;  i < numstr.length; i++ ){
			btn[ i ] = new Button (numstr[ i ]);
			btn[ i ].addActionListener( this );
			p2.add(btn[i]);

		}
		btn[16].setForeground(Color.red);
		btn[0].setForeground(Color.blue);
		btn[1].setForeground(Color.blue);
		btn[2].setForeground(Color.blue);
		btn[4].setForeground(Color.blue);
		btn[5].setForeground(Color.blue);
		btn[6].setForeground(Color.blue);
		btn[8].setForeground(Color.blue);	
		btn[9].setForeground(Color.blue);
		btn[10].setForeground(Color.blue);
		btn[12].setForeground(Color.blue);
		
	}
	
	public void actionPerformed( ActionEvent ae )
	{	
		
		
		store = ae.getActionCommand();
		if ( store.equals("=") ){
			storestr = tf.getText();
			Tok= new StringTokenizer(storestr, "*+/-", true);
			while( Tok.hasMoreTokens() ){
				str[cnt] = Tok.nextToken();
				cnt++;
			}
			num[0] = Float.parseFloat( str[0] );
			num[1] = Float.parseFloat( str[2] );
			
			if ( str[1].equals("*") ){
				sum = (int)(num[0] *  num[1]);
				tf.setText(String.valueOf(sum));
			}
			else if ( str[1].equals("+") ){
				sum =(int) (num[0] +  num[1]);
				tf.setText(String.valueOf(sum));
			}
			else if ( str[1].equals("-") ){
				sum =(int)( num[0] -  num[1]);
				tf.setText(String.valueOf(sum));
			}
			else if ( str[1].equals("/") ){
				sum = (int)(num[0] /  num[1]);
				tf.setText(String.valueOf(sum));
			}
			
		}
		else if ( store.equals("CE") )
		{
			st = "";
			store = "";
			cnt = 0;
			tf.setText("0");
		}											
		else{
			st += store;
			tf.setText(st);
		}
				
										
	}
			  	
	public static void main(String args[])
	{
		Calculator f = new Calculator();
		f.setSize(200,200);
		f.show();

	}
}

Peace

Now try writing this program using the Swing API!!!

I dont know why you would want to show off your java code at a C board but anywho.

A few errors:
I couldnt close it using the X

8/9 returned 0, when it should return 0.8888888888888889, according to my windows calculator

2.2 + 3 = 5, so decimal addition doesnt work either

I just tried a few things and got these errors, who knows, there could be more.!!!!

Originally posted by MethodMan
I dont know why you would want to show off your java code at a C board but anywho.

A few errors:
I couldnt close it using the X

8/9 returned 0, when it should return 0.8888888888888889, according to my windows calculator

2.2 + 3 = 5, so decimal addition doesnt work either

I just tried a few things and got these errors, who knows, there could be more.!!!!

Showoff hummm...well that interesting ...very interesting ... what does that have to mean isnt this a general discuttion board ... ****** i cant take this world with dummies ...

well yeas i dint introduce float calculation so thats whi it game u zero thas not an error .. click x and it does not close ....not my fault i havent done windowsevent listener .....

Mister C i will try swing but at the movement we are just using awt plain ...

Originally posted by Cgawd
look whos talking, you made 11 typos, maybe you should check yourself before you criticize others...

Machod pahen ke chuut ...do u know what it means ..well english is not my first lang and if a person makes a typo that does not make him a dummy or does it wize chuut

Originally posted by Shadow12345
Machod pahen ke chuut = I spell like a chipmunk

lol hahah you do ??? lol