Question

1. Inside of the class, Asg1Part2, write a main method that computes the sum of the numbers from 1 to 100. Print that sum with a message.
2. Run the main method (run class Asg1Part2). Check that the output is correct.
3. Inside of class Asg1Part2, add additional code to the main method to ALSO compute the sum of the numbers from 1 to 2000 that are evenly divisible by 13. Print that sum with a message.
4. Run the class Asg1Part2 (main method in that class). Check that the output is correct.
5. Add more code to the main method in class Asg1Part2, to compute the "sum of the squares" of all the numbers from 1 to 50, i.e. 1*1 + 2*2 + 3*3 + ... +50*50. Print the sum with a message. (note, do not print a running sum, just the final sum).

Answer 1

public class Asg1Part2 {
   public static void main(String[] args) {
       int sum = 0;
       // finding the sum of numbers from 1 to 100
       for (int i = 1; i <= 100; i++)
           sum += i;

       System.out.println("Sum of numbers from 1 to 100 : " + sum);
       sum = 0;
       // finding the sum of numbers from 1 to 2000
       for (int i = 1; i <= 2000; i++) {
           // checking if it is divisable by 13 than only add to sum
           if (i % 13 == 0)
               sum += i;

       }

       System.out.println("Sum of numbers from 1 to 2000 which are divisable by 13 : " + sum);
       sum = 0;
       // finding the sum of squares of numbers from 1 to 50
       for (int i = 1; i <= 50; i++)
           sum += i * i;
       System.out.println("Sum of squares of 1 to 50 : " + sum);

   }
}