import java.util.Scanner;
public class Calculator
{
public static void main(String[]args)
 {
double num
double num2
int calc1
double calc2
Scanner in=new Scanner(System.in);
System.out.println("Enter the first number");
num=in.nextDouble();
System.out.println("What do you want to do? 1 = Multiply , 2 = Subtract 3 = Add , 4 = Divide");
calc1=in.nextInt();
System.out.println("Enter the 2nd number");
calc2=0
if (calc1 == 1)
calc2=num*num2;
if (calc1 == 2)
calc2=num-num2;
if (calc1 == 3)
calc2=num+num2;
if (calc1 == 4)
calc2=num/num2;
System.out.println("Your answer is " +calc2);
}
}