Question

Perfect number Program in OS

Answer 1

Perfect number is a number which is equal to sum of its divisor. For eg,divisors of 6 are 1,2 and 3. The sum of these divisors is 6. So 6 is called as perfect number.

List of perfect numbers is available @ https://en.wikipedia.org/wiki/List_of_perfect_numbers

Here is a C program to check whether a number is perfect or not:

#include <stdio.h>

int main()

{

int number, remainder, sum = 0, i;

printf("Enter a Number\n");

scanf("%d", &number);

for (i = 1; i <= (number - 1); i++)

{

remainder = number % i;

if (remainder == 0)

{

sum = sum + i;

}

}

if (sum == number)

printf("%d is perfect number",number);

else

printf("%d is not a perfect number", number);

return 0;

}