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javaloopsfor-loopperfect-numbers

Perfect number from input

I'm trying to print out if a number is perfect or not by having the user enter in a number. When I enter a perfect number like 6, for example, it tells me that it is not a perfect number and can't figure out why. My final code needs to print out like 6 = 1 + 2 + 3. But I'm not that far yet.

    Scanner scanner = new Scanner(System.in);
    System.out.println("Enter a positive integer: ");
    int n = scanner.nextInt();

    int sum = 0;


    for(int i = 1;i<n;i++){

            if(n%2==0)
            sum += i;
    }

        if(sum==n){
            System.out.println(n + " is a positive number");
        }



        else {
            System.out.println(n + " is not a positive number");


    }
Solution

  • if(n%2==0)

    should be

    if(n%i==0)

    Otherwise your sum would be the sum of all numbers from 1 to n-1 for even n, or 0 for odd n.