Authors:
Michael T. Goodrich, Roberto Tamassia, Michael H. Goldwasser
Chapter:
Java Primer
Exercise:
Exercises
Question:7 | ISBN:9781118771334 | Edition: 6
Question
Write a short Java method that takes an integer n and returns the sum of the squares of all positive integers less than or equal to n.
Answer
package java_problems_datastructures;
import java.util.Scanner;
public class SumOfSquares {
static int number;
long sum;
private void takeInput() {
Scanner scanner = new Scanner(System.in);
System.out.println("please enter a number ");
number = scanner.nextInt();
scanner.close();
}
// calculate the sum of square of integers
private long sumOfSquareIntegers(int n) {
for (int i = 0; i <= number; i++) {
sum += (i * i);
}
return sum;
}
public static void main(String[] args) {
SumOfSquares squares = new SumOfSquares();
squares.takeInput();
System.out.println("sum of squares of all positive integers less than or equal to " + number +" is: "+ squares.sumOfSquareIntegers(number));
}
}