Classes and Objects C++ program to find the perfect numbers within a given range

//simple class
#include<iostream>
//header file
using  namespace std;
//using namespace
class perfect
//class declaration with name perfect
{
//starting of class
    private:
//it's a class accessed only by the function inside the class
   int num,i,st,end,sum;
//integer type number, i, starting and ending number
    public:
//function public is accessible outside the class
     void in()
//void keyword specifies that function does not return a value
     {
     	cout<<"Enter starting number=";
//display starting number
     	cin>>st;
//take starting number from user
     	cout<<"Enter ending ending number=";
//display ending number
     	cin>>end;
//take ending number from user
	 }
	 void disp()
//use to display a message on screen using void
    {
//starting loop
	 	for(num=st;num<=end;num++)
//this loop execute with having number equal to starting number and if the number is less than the ending number then increment in number until condition is true
{
		i=1;
		sum=0;
		while(i<num)
//i is less than number 1 and sum is 0 and i is less than number
		{
			if(num%i==0)
//number divided by 2 and if equal to 0 than it is even number
			sum=sum+i;
//than value of i added in sum
			i++;
//increment in i
		}
		if(sum==num)
//if sum equal to number 
		cout<<"The perfect  number within the given range="<<num<<endl;
//it display the number is in given range
    }	
    } 
//loop end 
};	
int main()
//main funtion
{
	perfect obj;
// object of main class perfect
	obj.in();
//assign object to int
	obj.disp();
//assign object to display function 
}
//ending the main function