Program in C++ to find the perfect number between 1 to Nth Using function

Program in C++ to find the  perfect number between 1 to  Nth Using function

#include<iostream>
#include<conio.h>
 using namespace std;
 int isPerfect(int n);
 int main()
  {
   int a,p;
   cout<<"Enter a number:-";
    cin>>a;
    for(int j=1;j<=a;j++)
    {
    p=isPerfect(j);
    if(p==j)
    cout<<j<<" is perfect no.\n";
    //else 
     // cout<<a<<" is not perfect no.";
    }
  }
  int isPerfect(int n)
   {
     int sum=0,i;
     for(i=1;i<n;i++)
      {
       if(n%i==0)
        {
         sum+=i;
        }
     }
     return (sum);
   }

Output:-