Mathematical Library Methods

Chapter 7

Mathematical Library Methods

Class 10 - Logix Kips ICSE Computer Applications with BlueJ

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Java Program: Using Mathematical Functions

13. Write the equivalent Java statements for the following, by using the mathematical functions:

i. Print the positive value of -999.

ii. Store the value -3375 in a variable and print its cube root.

iii. Store the value 999.99 in a variable and convert it into its closest integer that is greater than or equal to 999.99.

import java.util.Scanner;
 
public class MathFunctionsDemo {
    public static void main(String[] args) {
 
        // i. Print the positive value of -999
        int a = -999;
        System.out.println("Positive value of -999 = " + Math.abs(a));
 
        // ii. Store -3375 and print its cube root
        double b = -3375;
        System.out.println("Cube root of -3375 = " + Math.cbrt(b));
 
        // iii. Convert 999.99 to the closest integer greater than or equal to it
        double c = 999.99;
        System.out.println("Closest integer >= 999.99 = " + (int)Math.ceil(c));
    }
}

Positive value of -999 = 999
Cube root of -3375 = -15.0
Closest integer >= 999.99 = 1000

Explanation

i. Positive value

• Math.abs() returns the absolute (positive) value of a number.

ii. Cube root

• Math.cbrt() calculates the cube root.
• Cube root of -3375 = -15

iii. Closest integer greater than or equal to

• Math.ceil() rounds a number upward.
• Type casting to int converts the result to an integer.

✅ Math Functions Used