package mbogomolov;
public class Calculate {
public static void main(String[] args){
System.out.println("Hello World!");}  
}
package mbogomolov;
public class Calculate {
 	 double result;
 	 
		public void add(double first, double second){
			result = first + second;
		}
		public void substruct(double first, double second){
			result = first - second;
		}
		public void multiple(double first, double second){
			result = first * second;
		}
		
		public void div(double first, double second){
			result = first / second;
		}
	}
add 4 methods