我的问题出现在if语句中—如果变量“hours”大于10，我希望将额外的hours乘以2.00，并将结果加上9.95，但在编译时收到错误，我不明白原因。非常感谢您的帮助。

String choice;

    double hours;

    Scanner input = new  Scanner(System.in);

    System.out.print("Enter which package you are using A, B or C? ");
    choice = input.nextLine();
    choice = choice.toUpperCase();

    System.out.print("Enter the amount of  hours used: ");
    hours = input.nextDouble();

    switch ( choice )
    {
        case "A":
            if ( hours > 10 ){
                (( hours - 10) * 2 ) + 9.95;    << ERROR: Not a statement!
                }
            else
                System.out.println("Total: $9.95");
            break;

为便于参考，已将其答复和编辑为：

case "A":
            if ( hours > 10 ){
                total = (( hours - 10) * 2 ) + 9.95;    // Initialised to total
                System.out.println("Total: $" + total);
            }
            else
                System.out.println("Total: $9.95");
            break;