Controlling Program Flow - JAVA Programming for Engineers - page 96

Compound statement in loops
You have learned that the roster symbols ({ and }) are used in Java to group
several statements into a single block. Statement blocks are used in loop
constructs to make possible performing more than one processing opera-
tion. The following program, named Factorial.java, uses a statement block
inaforlooptodisplaythepartialproductduringthefactorialcalculation.

On the Web

The program Factorial.java is found in the Chapter 10 folder at
www.crcpress.com .

// File name: Factorial.java

// Reference: Chapter 10

//
// Java program to demonstrate looping

// Topics:

// 1. Using the for loop

// 2. Loop with multiple processing statements

//
// Requires:

// 1. Keyin class in the current directory

public class Factorial
{

public static void main(String[] args)
{

int number;
int facProd;
int curFactor;

System.out.println("FACTORIAL CALCULATION PROGRAM");
number = Keyin.inInt("Enter a positive integer: ");

facProd = number; // Initializing

for(curFactor = number - 1; curFactor > 1; curFactor—)
{

facProd = curFactor * facProd;
System.out.println("Partial product: " + facProd);
System.out.println("Current factor: " + curFactor);

}

// Display the factorial
System.out.println("\n\nFactorial is: " + facProd);

}

}