Define a class Calculator ,which has method for basic functionality like add, sub, mul, divde. Define another class Calc which inherits Calculator and add some method to like sin, cosine . WAP to demonstrate the working of Inheritance.

class Calculator {
 void add(int a, int b) {
  int c = a+b;
  System.out.println("Add = "+c);
 }
 void sub(int a, int b) {
  int c = a-b;
  System.out.println("Sub = "+c);
 }
 void mul(int a, int b) {
  int c = a*b;
  System.out.println("Mul = "+c);
 }
 void div(int a, int b) {
  float c = (float)a/b;
  System.out.println("Div = "+c);
 }
}
class Calc extends Calculator {
 void getSin(int a) {
  double x = Math.toRadians(a);
  double res = Math.sin(x);
  System.out.println("Result = "+res);
 }
 void getCos(int a) {
  double x = Math.toRadians(a);
  double res = Math.cos(x);
  System.out.println("Result = "+res);
 } 
}
class Main {
 public static void main(String[] a)
 {
  Calc c = new Calc();
  c.add(20,10);
  c.sub(20,10);
  c.mul(20,10);
  c.div(20,10);
  c.getSin(90);
  c.getCos(0); 
 }
}