Java: Check a number is a cube or not

Last update on May 15 2025 13:10:40 (UTC/GMT +8 hours)

Check Cube Number

Write a Java program to check if a number is a cube or not.

In arithmetic and algebra, the cube of a number n is its third power: the result of the number multiplied by itself twice:
n³ = n × n × n
Input Data:
Input a number: 8

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Example18 {

      public static void main( String args[] ){ 
        Scanner sc = new Scanner( System.in ); 
        System.out.print("Input a number: "); 
        int num = sc.nextInt(); 
       int n = (int) Math.round(Math.pow(num, 1.0/3.0));
        if((num == n * n * n))
			{
			   System.out.print("Number is a cube.");
            }
		   else
			{
				System.out.print("Number is not a cube.");
			}
				System.out.println("\n");
        }
     }

Sample Output:

Input a number: 8                                                                                             
Number is a cube.

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to determine if a number is a perfect cube by comparing the cube of its rounded cube root with the number.
• Write a Java program to compute the cube root iteratively and verify if cubing it returns the original number.
• Write a Java program to check for cube numbers using BigDecimal for high-precision cube root calculations.
• Write a Java program to generate a sequence of cube numbers up to a given limit using recursion.

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