question 1

Briefly describe the following program in a step-by-step manner.

String input = JOptionPane.showInputDialog("Please enter a number to square.");

double number = Double.parseDouble(input);

JOptionPane.showMessageDialog(null, "The number squared is " + (number * number));

question 2

Why does the following operation require that at least one of the two operands is of type double in Java?

double result = 5.0 / 2;