calculator added with functions

Author: Esha Saha

lab2/src/calculator.java

@@ -0,0 +1,15 @@
+package lab2;
+
+public class Calculator {
+
+    public int add(int a, int b) { return a + b; }
+
+    public int subtract(int a, int b) { return a - b; }
+
+    public int multiply(int a, int b) { return a * b; }
+
+    public double divide(int a, int b) {
+        if (b == 0) throw new ArithmeticException("Divide by zero");
+        return (double) a / b;
+    }
+}