Check whether a given number is a perfect number or not

SOURAV KUMAR PATRA December 25, 2019

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


C/C++/Java/Python Practice Question



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