Is Perfect Number

This algorithm checks whether a given number is perfect number or not. Perfect number is a number which is equal to sum of its divisor. For example divisors of 6 are 1,2 and 3. The sum of these divisors is 6. So 6 is called as perfect number.

• C#
• VB.Net
• C
• C++
• PHP

									public static bool IsPerfectNumber(int number)
{
	int sum = 0;
	int i = 1;

	while (i < number)
	{
		if (number % i == 0)
			sum += i;

		++i;
	}

	return sum == number;
}
								

Example

									bool isPerfectNumber = IsPerfectNumber(28);
								

Output

									true