Check whether a given number is a perfect number or not

Perfect Number:- If the Sum of all the Factors of a number comes out to be the number itself then the number is said to be a Perfect Number.

Example:-

 6, 28, 496, 8128......

Problem statement:- Program to check whether a given number is a perfect number or not.

Sample Input/Output:-

Sample Input First: 6                         Sample Output First: It is a Perfect Number

Sample Input Second: 12                  Sample Output Second: It is not a Perfect Number

Explanation:- 

For output 1st: Factors of 6 are =1,2,3. sum of factors is=1+2+3=6=Given Number 

For output 2nd: Factors of 12 are =1,2,3,4,6. sum of factors is=1+2+3+4+6=16≠Given Number

Data requirement:-

   Input Data:- num

  Output Data:-Sum

  Additional Data:- i, sum

Program in C
  

Here is the source code of the C Program to Check whether a given number is a perfect number or not.

Code:

#include<stdio.h>

int main()

{

    int num,i;

    printf("Enter a number:");

    scanf("%d",&num);

    int sum=0;

    for(i=1;i<num;i++)

    {

        if(num%i==0)

        {

            sum=sum+i;

        }

    }

   if(sum==num)

    printf("It is a Perfect Number");

   else

    printf("It is not a Perfect Number");

}

Input/Output:

Enter a number:6

It is a Perfect Number

Program in C++
  

Here is the source code of the C++ Program to Check whether a given number is a perfect number or not.

Code:

#include<iostream>

using namespace std;

int main()

{

    int num;

    cout<<"Enter a number:";

    cin>>num;

    int sum=0;

    for(int i=1;i<num;i++)

    {

        if(num%i==0)

        {

            sum=sum+i;

        }

    }

   if(sum==num)

    cout<<"It is a Perfect Number";

   else

    cout<<"It is not a Perfect Number";

}

Input/Output:

Enter a number:12

It is not a Perfect Number

Program in Java
  

Here is the source code of the Java Program to Check whether a given number is a perfect number or not.

Code:

import java.util.Scanner;

public class PerfectNumberOrNot {

public static void main(String[] args) {

Scanner cs=new Scanner(System.in);

int num,i;

    System.out.println("Enter a number:");

    num=cs.nextInt();

    int sum=0;

    for(i=1;i<num;i++)

    {

        if(num%i==0)

        {

            sum=sum+i;

        }

    }

   if(sum==num)

    System.out.println("It is a Perfect Number");

   else

    System.out.println("It is not a Perfect Number");

cs.close();

}

}

Input/Output:

Enter a number:

28

It is a Perfect Number

Program in Python
  

Here is the source code of the Python Program to Check whether a given number is a perfect number or not.

Code:

num=int(input("Enter a number:"))

sum=0
for i in range(1,num):
   if(num%i==0):
      sum=sum+i
if sum==num:
   print("It is a Perfect Number")
else:
    print("It is not a Perfect Number") 

Input/Output:

Enter a number:36

It is not a Perfect Number

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