Chapter 6: Iteration

Nested Loops

• Example: Print the multiplication table for the numbers from 1 through 9.

Processing Sentinal Values

Scanner in = new Scanner(System.in);
String input;

System.out.print("Enter data: ");
input = in.next();

while (!input.equals("quit"))
{
  // process input
  System.out.print("Enter data: ");
  input = in.next(); 
}

Random Numbers

• Technique 1

Random generator = new Random();
int someInteger = generator.nextInt();
double someDouble = generator.nextDouble();

• Technique 2

double someDouble = Math.random();

Simulations

• Buffon's needle experiment (described in book).
• Rolling a six-sided die.
• Using the unit circle to estimate the value for pi.

Lecture Code

• ProcessString.java