Page 122 - CTS - CSA TP - Volume 2

COMPUTER SOFTWARE APPLICATION - CITS

These examples demonstrate how to return data from methods in Java. The findMax method returns the maximum
of two numbers, while the generateRandomNumber method returns a randomly generated integer. By returning
data from methods, we can encapsulate logic and computations, making our code more modular and reusable.

TASK 3: Calculating the Factorial of a Number
public class FactorialDemo {
public static void main(String[] args) {

int n = 5;
// Calling the method to calculate the factorial of a number
long factorial = calculateFactorial(n);
System.out.println(“Factorial of “ + n + “ is: “ + factorial);
}

// Method to calculate the factorial of a number
public static long calculateFactorial(int n) {
if (n == 0) {
return 1;

} else {
long factorial = 1;
for (int i = 1; i <= n; i++) {
factorial *= i;
}
return factorial;

}
}
}
Output:

Explanation:

• In this program, we define a method calculateFactorial that takes an integer n as a parameter and returns the
factorial of n.
• We declare a variable n in the main method and assign a value to it.

• We call the calculateFactorial method and pass n as an argument.
• Inside the calculateFactorial method, we use a for loop to calculate the factorial of n.

107
CITS : IT & ITES - Computer Software Application - Exercise 96