Java program for Pronic Number

According to  A pronic number is a number which is the product of two consecutive integers, that is, a number of the form n(n + 1). It is also called oblong number, rectangular number or heteromecic number.
Examples : 0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462, 506, 552 etc

Method I

// Java program to find Pronic Number
import java.io.*;
class PronicNumber
{
public static void main(String args[]) throws IOException
{

int n, i;           // n for number and i for loop
boolean f=false;    // f for flag, initialize with false
System.out.print("Enter a number to find pronic or not : ");
for(i=1; i<=n; i++)
{
if(i*(i+1) == n)
{
f = true;
break;
}
}
// Checking the pronic number
if(f == true)
System.out.println(n+" is a Pronic Number.");
else
System.out.println(n+" is not a Pronic Number.");
}
}

Sample Output:
Enter a number to find pronic or not : 110
110 is a Pronic Number.
Enter a number to find pronic or not : 272
272 is a Pronic Number.
Enter a number to find pronic or not : 6
6 is a Pronic Number.
Enter a number to find pronic or not : 35
35 is not a Pronic Number.

Method II

// Java program to find Pronic Number
import java.io.*;
class PronicNumberWithFunction
{
int n, i;           // n instance variable for number and i for loop
boolean f=false;    // f instance for flag, initialize with false
boolean pronic()throws IOException
{
System.out.print("Enter a number to find pronic or not : ");
for(i=1; i<=n; i++)
{
if(i*(i+1) == n)
{
f = true;
break;
}
}
return f;
}
// Main method start
public static void main(String args[]) throws IOException
{
// Checking the pronic number
boolean f;
PronicNumberWithFunction ob = new PronicNumberWithFunction();
f = ob.pronic();
if(f == true)
System.out.println("A number is a Pronic Number.");
else
System.out.println("The number is not a Pronic Number.");
}
}

Sample Output:
Enter a number to find pronic or not : 12
The number is a Pronic Number.
Enter a number to find pronic or not : 130
The number is not a Pronic Number.

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