C program to find out perfect numbers from 1 and 50

/*Perfect no. is a +ve integer that is equal to the sum of its +ve divisors
    e.g. 28 is divible by 1,2,4,7,14 (excluding number itself)
        1+2+4+7+14=28
*/
#include<stdio.h>
#include<conio.h>

void print_perfect(int,int);  //function declration

void main()
{
    clrscr();              //Clear Screen
    print_perfect(1,50);   //This Function print perfects number
    getch();
}

void print_perfect(int start,int end)
{
    int div,sum;   //div for divisor, s for summation
    int num=start; //num for number under checking
    while(start<=end)      //loop from 1 to 50
    {
        div=1;sum=0;   //factor starts from 1,summation from zero
        while(div<num) //divisor must be less than number itself
        {
            if(num%div==0)  //it checks for divison
            {
                sum=sum+div;  //if it remainder is zero, divisor is added
            }
            div++; //next divisor
        }
        if(sum==num) printf("perfect no =%d\n",num); //if summation equal to number itself, it is perfect no. so print it
        num++;    // next number
    }
}//end of function

//End of the program