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Find The Perfect Number In C++

Find The Perfect Number In C++

What is a perfect number?
"Perfect number is a positive number which sum of all positive divisors excluding that number." 
For example 6 is Perfect Number since divisor of 6 are 1, 2 and 3. Sum of its divisor is
1 + 2+ 3 =6
and  28 is also a Perfect Number
 since 1+ 2 + 4 + 7 + 14= 28
Other perfect numbers: 496, 8128

    #include<iostream.h>
    #include<conio.h>
    void main()                 //Start of main
    {
      clrscr();
       int i=1, u=1, sum=0;
       while(i<=500)
     {                                  // start of first loop.

       while(u<=500)
       {                               //start of second loop.
         if(u<i)
         {
          if(i%u==0 )
          sum=sum+u;
         }                          //End of if statement
        
         u++;
       }                           //End of second loop

       if(sum==i)
       {
        cout<<i<<" is a perfect number."<<"\n";
       }

       i++;
       u=1;  sum=0;
     }                             //End of First loop
       getch();
     }                            //End of main

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