Check whether a number is perfect or not

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The below program takes a integer as input and checks whether the input is a perfect number or not. Perfect number is a positive integer which is the sum of its proper positive divisor which means the sum of its positive divisors excluding the number itself.

Ex:

6 is a perfect number as it is sum of proper positive number.
6=1+2+3
28 is a perfect number as it is sum of proper positive number.
28=1+2+4+7+14

Code:

#include<iostream>
using namespace std;

int main()
{
    int n,r=0;
    cout<<"Enter a number : ";
    cin>>n;
    for(int i=1;i<n;i++)
    {
        if(n%i==0)
            r=r+i;
    }
    if(r==n)
        cout<<n<<" is a perfect number.";
    else
        cout<<n<<" is not a perfect number.";
    return 0;

}

Output:


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