Problem 3

import javax.swing.*;

public class WinningPercentage
{
    public static void main(String[] args)
    {
	// get input from user

	String input = JOptionPane.showInputDialog("Enter record (like 10-2-1)");
	// find the position of the first hyphen

	int pos1 = input.indexOf('-');

	// find the position of the second hyphen

	int pos2 = input.indexOf('-', pos1 + 1);

	// get wins, then losses, the ties

	int wins = Integer.parseInt(input.substring(0, pos1));
	int losses;
	int ties;

	if (pos2 != -1)
	    {
		losses = Integer.parseInt(input.substring(pos1 + 1, pos2));
		ties = Integer.parseInt(input.substring(pos2 + 1));
	    }
	else
	    {
		losses = Integer.parseInt(input.substring(pos1 + 1));
		ties = 0;
	    }

	// get total games

	int games = wins + losses + ties;

	// compute winning percentage

	double pct = (wins + ties * 0.5) / games;

	// display result

	JOptionPane.showMessageDialog(null, "Winning pct: " + pct);
    }
}

This code can also be downloaded from the file WinningPercentage.java.

Problem 5

a) 1
b) 4
c) 1
d) 9
e) 16
f) 256
g) 25
h) 9
i) 100
j) 100
k) 100
l) 16
m) 100
n) 16