## JAVA EXAMPLE PROGRAMS

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# Program: Write a program to find perfect number or not.

 Description: ```A perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself. Equivalently, a perfect number is a number that is half the sum of all of its positive divisors. The first perfect number is 6, because 1, 2 and 3 are its proper positive divisors, and 1 + 2 + 3 = 6. Equivalently, the number 6 is equal to half the sum of all its positive divisors: ( 1 + 2 + 3 + 6 ) / 2 = 6.```

 Code: ```package com.java2novice.algos; public class IsPerfectNumber { public boolean isPerfectNumber(int number){ int temp = 0; for(int i=1;i<=number/2;i++){ if(number%i == 0){ temp += i; } } if(temp == number){ System.out.println("It is a perfect number"); return true; } else { System.out.println("It is not a perfect number"); return false; } } public static void main(String a[]){ IsPerfectNumber ipn = new IsPerfectNumber(); System.out.println("Is perfect number: "+ipn.isPerfectNumber(28)); } }```

 Output: ```28 It is a perfect number Is perfect number: true```