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Recursive function For counting all the perfect number from 1 to n.

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What is a perfect number?  A perfect  number  is a  positive integer  that is equal to the sum of its positive  divisors , excluding the number itself. For instance, 6 has divisors 1, 2 and 3 (excluding itself), and 1 + 2 + 3 = 6, so 6 is a perfect number.  C program to count all perfect numbers from 1to N. #include"stdio.h" int perfect(int num) {     /* function to check number is perfect or not*/     if(num<1)     {         return 0;     }     int i, sum, n;     sum = 0;     n = num;     for(i=1; i<n; i++)     {         /* If i is a divisor of num */         if(n%i == 0)         {             sum += i;         }     }     if(num==sum)     {         printf("number is %d\n",num); ...