对于我的计算机科学课程，我正在制作一个计算器，用户输入两个数字并选择要对其进行处理（乘，加，乘）。对于选项d，我必须让用户输入两个新数字，这些数字应在随后的选择/计算中使用，换句话说，返回到开头并遍历选项，但要包含新数字。这是我到目前为止的代码，
public class Calculator
{
public static void main (String [] args)
{
double x, y, result;
char choice;
x = Input.readDouble("Enter the first number: ");
y = Input.readDouble("Enter the second number: ");
String menu = "Choose what to do with " + x + " and " + y + ":\n";
menu = menu + "a. Add them.\n";
menu = menu + "b. Multiply them.\n";
menu = menu + "c. Exponentiate them.\n";
menu = menu + "d. Enter new numbers.\n";
menu = menu + "e. QUIT.";
boolean again = true;
while (again)
{
choice = Input.readChar(menu);
Output.showValue("You chose ", choice);
switch (choice)
{
case 'a':
result = x + y;
Output.showMessage(x + " + " + y + " is " + result);
break;
case 'b':
result = x * y;
Output.showMessage(x + " x " + y + " is " + result);
break;
case 'c':
result = (Math.pow(x, y));
Output.showMessage(x + " ^ " + y + " is " + result);
break;
case 'd': //user enters new numbers to go throught he list with new numbers
x = Input.readDouble("Enter the first number: ");
y = Input.readDouble("Enter the second number: ");
continue; //or should I use break again?
case 'e':
Output.showMessage("Goodbye!");
again = false;
break;
default:
Output.showMessage("ERROR: " + choice + " is not a valid choice.");
} //end switch
} //end while
} //end method main
} //end class Calculator