update,

it114105/itp3914/Lab09/Ex7.java

@@ -0,0 +1,23 @@
+import java.util.Scanner;
+public class Ex7 {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.print("? ");
+        int num = input.nextInt();
+        if(isPrime(num))
+            System.out.printf("%d is a prime number\n", num);
+        else
+            System.out.printf("%d is not a prime number\n", num);
+    }
+
+    public static boolean isPrime(int num) {
+        if(num==2)
+            return true;
+        
+        for (int i = 2; i < num; i++){
+            if (num%i == 0)
+                return false;
+        }
+        return true;
+    }
+}