Java: Check whether a number is a Pronic Number or Heteromecic Number or not
Java Numbers: Exercise-13 with Solution
Write a Java program to check whether a number is a Pronic or Heteromecic Number or not.
A pronic number is a number which is the product of two consecutive integers, that is, a number of the form n(n + 1).
The first few pronic numbers are:
0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462 … etc.
Test Data
Input a number : 110
Pictorial Presentation:
Sample Solution:
Java Code:
import java.util.Scanner;
public class Example13 {
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.print("Input a number : ");
int num = sc.nextInt();
int ans = 0;
for(int i=0; i<num; i++)
{
if(i*(i+1) == num)
{
ans = 1;
break;
}
}
if(ans == 1)
System.out.println("Pronic Number.");
else
System.out.println("Not a Pronic Number.");
}
}
Sample Output:
Input a number : 110 Pronic Number.
Flowchart:

Java Code Editor:
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Previous: Write a Java program to check whether a number is a Harshad Number or not.
Next: Write a Java program check whether a number is an Automorphic number or not.
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Java: Tips of the Day
IsPowerOfTwo
Checks if a value is positive power of two.
To understand how it works let's assume we made a call IsPowerOfTwo(4).
As value is greater than 0, so right side of the && operator will be evaluated.
The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.
The result of (value & value) is value. 100 & 100 => 100.
This will value the expression to true as value is equal to value.
public static boolean isPowerOfTwo(final int value) { return value > 0 && ((value & (~value + 1)) == value); }
Ref: https://bit.ly/3sA5d4I
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