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Author: M-F-Tushar

OOP in Java/Chapter 10 - Object-Oriented Thinking/Code_Example/Exercise10_06.java

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+package ch_10;
+
+import ch_10.exercise10_05.StackOfIntegers;
+
+/**
+ * *10.6 (Displaying the prime numbers) Write a program that displays all the prime
+ * numbers less than 120 in decreasing order. Use the StackOfIntegers class
+ * to store the prime numbers (e.g., 2, 3, 5, ...) and retrieve and display them in
+ * reverse order.
+ */
+public class Exercise10_06 {
+    public static void main(String[] args) {
+        StackOfIntegers stackOfIntegers = new StackOfIntegers();
+        StackOfIntegers reverseStack = new StackOfIntegers();
+        int n = 120;
+        for (int i = 2; i < n; i++) {
+            if (checkPrime(i)) {
+                stackOfIntegers.push(i);
+            }
+        }
+
+        System.out.println("All prime numbers less than 120, in reverse order: ");
+        while (stackOfIntegers.getSize() > 1) {
+            System.out.print(stackOfIntegers.pop() + ", ");
+        }
+        System.out.print(stackOfIntegers.pop());
+    }
+
+    static boolean checkPrime(int num) {
+        boolean prime = true;
+        for (int f = 2; f * f <= num; f++) {
+            if (num % f == 0) {
+                prime = false;
+                break;
+            }
+        }
+        return prime;
+
+    }
+}