Mathematical Library Methods

Chapter 7

Mathematical Library Methods

Class 10 - Logix Kips ICSE Computer Applications with BlueJ

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Java Program: Generate Random Integers in Given Ranges

11. Write a program to generate random integers in the following ranges:

i. 10 to 20 (both inclusive)
ii. 25 to 50 (both inclusive)

import java.util.Scanner;
 
public class RandomNumberRange {
    public static void main(String[] args) {
 
        // Random number between 10 and 20 (inclusive)
        int r1 = (int)(Math.random() * (20 - 10 + 1)) + 10;
 
        // Random number between 25 and 50 (inclusive)
        int r2 = (int)(Math.random() * (50 - 25 + 1)) + 25;
 
        // Output
        System.out.println("Random number between 10 and 20: " + r1);
        System.out.println("Random number between 25 and 50: " + r2);
    }
}

Sample Output 
Random number between 10 and 20: 17
Random number between 25 and 50: 43

Explanation

Formula Used

• Math.random() generates a value between 0.0 and 0.999...
• Multiplying by (max - min + 1) sets the range size
• Adding min shifts the range to the required starting value
• Type casting to int removes the decimal part