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Wednesday, 21 September 2016

Chapter 10 Exercise 17, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

Chapter 10 Exercise 17:

10.17 (Square numbers)
Find the first ten square numbers that are greater than Long.MAX_VALUE.
A square number is a number in the form of n2. For example, 4, 9, and 16
are square numbers. Find an efficient approach to run your program fast.

import java.math.BigDecimal;

public class Exercise_17 {

    public static void main(String[] args) {

        BigDecimal longMaxValue = new BigDecimal(Long.MAX_VALUE);
        long start = (long) Math.sqrt(Long.MAX_VALUE);
        BigDecimal n = new BigDecimal(start);
        int count = 0;


        while (count < 10) {

            BigDecimal squared = n.multiply(n);
            if (squared.compareTo(longMaxValue) > 0) {
                count++;
                System.out.println(count+": " + n + " squared = " + squared);
            }
            n = n.add(BigDecimal.ONE);
        }
    }

}

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