For this project, you will create a program that asks the user to enter a positi

Question

For this project, you will create a program that asks the user to enter a positive integer value less than 20. If the user enters a number greater than 20, the user should get an error. If the user enters a number equal to or less than 20, display the double of each value beginning with 1 up to the selected number (multiply each number by 2), then provide the total of all doubles.

For example, if the user entered the number 5, the following should display:

Double up 1 = 2

Double up 2 = 4

Double up 3 = 6

Double up 4 = 8

Double up 5 = 10

Total = 30

Minimum Requirements:

Create a class that has 3 public functions.

A mutator function should take the number from the user and store it in a private variable.

Another function should perform the calculations, display the double up results and store the total in a private variable. This function must use a loop.

An accessor function should display the total.

Create a main function that creates an object of your class and calls each of the functions of the class.

Explanation / Answer

class Doubleup
{
private int number;
private int total;
public void getNum(int no)
{
number=no;
}
public int doubleup(int num)
{
for(int i=1;i<=num;i++)
{
System. out.println("doubleup "+i+ (i+i));
total+=i+i;
}
}
public void display()
{
System. out.println(" Total="+total);
}
}
class DoubleupDemo
{
public static void main(String[] args)
{
Doubleup d= new Doubleup();
Scanner sc= new Scanner( System.in));
System. out.println("enter any number");
int no=sc.nextInt();

if(no>20)
System.out.println("error");
else
{
d.getNum(no);
d.doubleup(no);
d.display ();
}
}
}

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