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Author: M-F-Tushar

OOP in Java/Chapter 10 - Object-Oriented Thinking/Code_Example/Exercise10_17.java

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+package ch_10;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.Arrays;
+
+/**
+ * 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.
+ */
+public class Exercise10_17 {
+    public static void main(String[] args) {
+        BigInteger maxLongVal = BigInteger.valueOf(Long.MAX_VALUE);
+        int count = 0;
+        long rootNum = (long) Math.sqrt(maxLongVal.doubleValue());
+        BigInteger root = BigInteger.valueOf(rootNum);
+        BigInteger[] result = new BigInteger[10];
+        while (count < 10) {
+            root = root.add(BigInteger.ONE);
+            BigInteger n2 = root.pow(2);
+            if (n2.compareTo(maxLongVal) > 0) {
+                result[count] = n2;
+                count++;
+            }
+
+        }
+        System.out.println("Long.MAX_VALUE = " + Long.MAX_VALUE);
+        System.out.println("The square numbers greater than Long.MAX_VALUE are: ");
+        System.out.println(Arrays.toString(result));
+
+
+    }
+}