This is an example program that demonstates some of the topics covered in week 3 and prior weeks. See comments for the details of what it demonstrates.
Sample output:
Source Code:
/*=============================================
Purpose: Simulates the rolling of
one die for two player and
produces statistics
Demonstrates:
1. for flow structure
2. if, else if, else flow structure
3. accumulators
4. Math.random for random numbers
5. System.println
6. System.print
7. \n and \t escape characters
8. ++ and += operators
9. Nesting of flow structures
Version history:
Number: 1.0.0
Date: 4/8/2003
Programmers: Lon Hosford
Changes: Original programming
=============================================*/
public class DiceRoller
{
/*---------------------------------------------
Program starts here. No arguments are expected.
---------------------------------------------*/
public static void main(String [] args)
{
/*---------------------------------------------
| Declare variables private |
| to the main method |
---------------------------------------------*/
/*---------------------------------------------
Total rolls for the human
---------------------------------------------*/
long dieValuesTotalHuman = 0;
/*---------------------------------------------
Total wins for the human
---------------------------------------------*/
long winsCountHuman = 0;
/*---------------------------------------------
The value of the die for human
---------------------------------------------*/
int dieValueHuman;
/*---------------------------------------------
Total rolls for the computer
---------------------------------------------*/
long dieValuesTotalComputer = 0;
/*---------------------------------------------
Total wins for the computer
---------------------------------------------*/
long winsCountComputer = 0;
/*---------------------------------------------
The value of the die for computer
---------------------------------------------*/
int dieValueComputer;
/*---------------------------------------------
Total ties
---------------------------------------------*/
long tiesCount = 0;
/*---------------------------------------------
Winner name
---------------------------------------------*/
String winnerName;
/*---------------------------------------------
Display report detail report header
---------------------------------------------*/
System.out.println("Roll #\tHuman\tComputer Winner");
System.out.println("=======\t=======\t======= ======= ");
/*---------------------------------------------
Counter loop 1 to 10 for each die roll
---------------------------------------------*/
for ( int rollNumber = 1; rollNumber <= 10; rollNumber++)
{
/*---------------------------------------------
Random die roll for human player
---------------------------------------------*/
dieValueHuman = (int) (Math.random() * 6 + 1); // 1- 6
/*---------------------------------------------
Random die roll for computer player
---------------------------------------------*/
dieValueComputer = (int) (Math.random() * 6 + 1); // 1- 6
/*---------------------------------------------
Human die roll value exceeds computer die roll value
---------------------------------------------*/
if (dieValueHuman > dieValueComputer)
{
/*---------------------------------------------
Set name for winner report column
---------------------------------------------*/
winnerName = "Human";
/*---------------------------------------------
Accumulate wins count for human
---------------------------------------------*/
winsCountHuman++;
/*---------------------------------------------
Accumulate die value total for human
---------------------------------------------*/
dieValuesTotalHuman += dieValueHuman;
}
/*---------------------------------------------
Computer die roll value exceed human die roll value
---------------------------------------------*/
else if (dieValueHuman < dieValueComputer)
{
/*---------------------------------------------
Set name for winner report column
---------------------------------------------*/
winnerName = "Computer";
/*---------------------------------------------
Accumulate wins count for computer
---------------------------------------------*/
winsCountComputer++;
/*---------------------------------------------
Accumulate die value total for computer
---------------------------------------------*/
dieValuesTotalComputer += dieValueComputer;
}
/*---------------------------------------------
Human die roll value equals computer die roll value
---------------------------------------------*/
else
{
/*---------------------------------------------
Set name for winner report column
---------------------------------------------*/
winnerName = "Tied";
/*---------------------------------------------
Accumulate tie count
---------------------------------------------*/
tiesCount++;
}
/*---------------------------------------------
Display data for each column in report
roll number
die value for human
die value for computer
name of the winner
---------------------------------------------*/
System.out.println( rollNumber + "\t"
+ dieValueHuman + "\t"
+ dieValueComputer + "\t "
+ winnerName);
}
/*---------------------------------------------
Underscore detail report and display totals
---------------------------------------------*/
System.out.println("=======\t=======\t=======");
System.out.println( "Total" + "\t" + dieValuesTotalHuman + "\t" + dieValuesTotalComputer);
/*---------------------------------------------
Start summary report
---------------------------------------------*/
System.out.println("\nSummary:");
System.out.print( "Wins" + "\t" + winsCountHuman + "\t" + winsCountComputer);
/*---------------------------------------------
Ties count exceeds 0
---------------------------------------------*/
if (tiesCount > 0 )
{
/*---------------------------------------------
Add ties count stats to current
console line
---------------------------------------------*/
System.out.print("\tTied: " + tiesCount);
}
/*---------------------------------------------
New console line
---------------------------------------------*/
System.out.println();
/*---------------------------------------------
Start report line for winner based on total of
die values for all rolls
---------------------------------------------*/
System.out.print("Winner based on total of all rolls... ");
/*---------------------------------------------
Die value total for human exceeds
same for computer
---------------------------------------------*/
if ( dieValuesTotalHuman > dieValuesTotalComputer)
{
System.out.println("Human");
}
/*---------------------------------------------
Die value total for computer exceeds
same for human
---------------------------------------------*/
else if (dieValuesTotalHuman < dieValuesTotalComputer)
{
System.out.println("Computer");
}
/*---------------------------------------------
Die value total for computer equals
same for human
---------------------------------------------*/
else
{
System.out.println("Tied");
}
/*---------------------------------------------
Start report line for winner based on total of
wins
---------------------------------------------*/
System.out.print("Winner based on number of wins....... ");
/*---------------------------------------------
Win count for human exceeds
same for computer
---------------------------------------------*/
if ( winsCountHuman > winsCountComputer)
{
System.out.println("Human");
}
/*---------------------------------------------
Win count for computer exceeds
same for human
---------------------------------------------*/
else if (winsCountHuman < winsCountComputer)
{
System.out.println("Computer");
}
/*---------------------------------------------
Win count for computer equals
same for human
---------------------------------------------*/
else
{
System.out.println("Tied");
}
} // End of main method
}
