It opens and closes mission control
An object is an element (or instance) of a class; objects have the behaviors of their class. The object is the actual component of programs, while the class specifies how instances are created and how they behave. method: a method is an action which an object is able to perform.
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Answer:
c4 instanceof C2 evaluates to false.
Explanation:
As C2 extends C1 so c2 instanceof C1 evaluates to true.
As C3 extends C2 which then extends C1 so c3 instanceof C1 evaluates to true.
As the object c1 is an instance of C1 class so c1 instanceof C1.
Therefore only c4 instanceof C2 evaluates to false.
I would say A. Test it and receive feedback
Answer:
import java.util.Scanner;
public class CalculatingSales {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int product, quantity;
double total = 0;
while(true) {
System.out.println("Enter product_id and quantity(0 0 to stop): ");
product = sc.nextInt();
quantity = sc.nextInt();
if(product==0 && quantity == 0)
break;
switch (product) {
case 1:
total = total + 2.98*quantity;
break;
case 2:
total = total + 4.50*quantity;
break;
case 3:
total = total + 9.98*quantity;
break;
case 4:
total = total + 4.49*quantity;
break;
case 5:
total = total + 6.87*quantity;
break;
default:
System.out.println("Invalid option");
}
}
System.out.println("total value: "+total);
sc.close();
}
}
Explanation:
- Take the product and quantity as input from user.
- Use a switch statement to multiply the total with their relevant value.
- Display the total value.