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import java.awt.*;
import java.applet.*;

public class calculator extends Applet {
	TextField display;
	int saveNum = 0;
	int memNum = 0;
	char op = '=';
	char lastOp = '=';
	boolean newNum = true;
	
	public void init() {
		setBackground(Color.white);

display = new TextField("0",6);
		display.setEditable(false);
		add(display);
		
		Panel p = new Panel();
		p.setLayout(new GridLayout(5, 4));
		for (int i = 1; i <= 9; i++) {
			p.add(new Button("" + i));
			if (i==3)
				p.add(new Button("+"));
			if (i==6)
				p.add(new Button("-"));
		}	
		p.add(new Button("*"));
		p.add(new Button("%"));
		p.add(new Button("0"));
		p.add(new Button("±"));
		p.add(new Button("/"));
		p.add(new Button("M"));
		p.add(new Button("RM"));
		p.add(new Button("C"));
		p.add(new Button("="));
		add(p);
	}
	
	public boolean action(Event evt, Object arg) {
		if (arg instanceof String) {
			String s = (String) arg;
			if (s.charAt(0) >= '0' && s.charAt(0) <= '9') {
				if (newNum)
					display.setText(s);
				else
					display.setText(display.getText() + s);
				newNum = false;
			}
			else {
				if (s.charAt(0) == '-' && newNum) {
					display.setText("-");
					newNum = false;
				}
				else {
					op = s.charAt(0);
					calc (Integer.parseInt(display.getText()));
					newNum = true;
				}
				lastOp = op;
			}
			return true;
		}
		return super.action(evt, arg);
	}
	
	public void calc(int n) {
		switch (op) {
			case '+':
			case '-':
			case '*':
			case '/':
			case '%':
				saveNum = n;
				return;
		}
	
		if (op == '=')
			op = lastOp;
		
		switch (op) {
			case '+':
				saveNum += n;
				break;
			case '-':
				saveNum -= n;
				break;
			case '*':
				saveNum *= n;
				break;
			case '/':
				saveNum /= n;
				break;
			case '%':
				saveNum %= n;
				break;
			case 'M':
				memNum = n;
				saveNum = n;
				break;
			case 'R':
				saveNum = memNum;
				break;
			case 'C':
				saveNum = 0;
				break;
			case '±':
				saveNum = -n;
				break;
		}
		display.setText("" + saveNum);
	}
}