first commit

exercise2/first.java

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+import java.util.Scanner;
+public class first{
+    public static void main(String[] args) {
+        int test1;
+        int test2;
+        double radius;
+        System.out.println("Test Data:");
+        System.out.println("a. "+(-5 + 8 * 6));
+        System.out.println("b. "+ ((55+9) % 9));
+        System.out.println("c. "+ (20 + -3*5 / 8));
+        System.out.println("d. "+ (5 + 15 / 3 * 2 - 8 % 3));
+
+        Scanner scan = new Scanner(System.in);
+        System.out.println("Enter integer 1");
+        test1 = scan.nextInt();
+        
+        System.out.println("Enter integer 2");
+        test2 = scan.nextInt();
+
+        System.out.println("The PRODUCT of two integer: "+ (test1*test2));
+
+        System.out.println("Enter radius of a circle! (pi taken as 3!)");
+        radius = scan.nextDouble();
+        System.out.println("The area of circle: "+(3*radius*radius)+"\nThe perimeter of circle: "+(2*3*radius));
+    }
+}

helloworld.java

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+import java.util.Scanner;
+public class helloworld {
+    public static void main(String[] args) {
+        String test;
+        Scanner scan = new Scanner(System.in);
+        System.out.println("ENTER A TEXT!");
+        test = scan.nextLine();
+        System.out.println("You entered\n" + test);
+        int result = 50;
+        System.out.println("Hello, World!");
+    }
+}