package exp3;

class A{
    int sum,num1,num2;
   public A(){
       num1=10;
       num2=20;
       sum=0;
   }
   void sum1(){
       sum=num1+num2;
       System.out.println("sum="+num1+"+"+num2+"="+sum);   	
   }
   void sum2(int n){
       num1=n;
       sum=num1+num2;
       System.out.println("sum="+num1+"+"+num2+"="+sum);   	
   }
}

class B extends A{
    int num2;
   public B(){
       num2=200;
   }
   void sum2(){
       sum=num1+num2;
       System.out.println("sum="+num1+"+"+num2+"="+sum);
   }
   void sum2(int n){
       num1=n;
       sum=num1+num2;
       System.out.println("sum="+num1+"+"+num2+"="+sum);
   }
   void sum3(int n){
       super.sum2(n);
       System.out.println("sum="+num1+"+"+num2+"="+sum);
   }
}
public class test{
    public static void main (String arg[]){
        B m=new B();
       m.sum1();
       m.sum2();
       m.sum2(50);
       m.sum3(50);
   }
}