陷入循环？

Question

我正在为一个项目制作一个银行机器代码，但每当您登录时都会出错。执行此操作的代码部分是这样的：

if(pincheck == pin){
                loggedin = true;
                pincheck = 0;
                do{
                    System.out.println("Welcome, " + name);
                    System.out.println("");
                    System.out.println("Your account balance is $" + balance);
                    System.out.println("");
                    System.out.println("Press 1 to deposit funds");
                    System.out.println("Press 2 to withdraw funds");
                    System.out.println("Press 3 to log out");
                    System.out.println("");
                    options = in.nextInt();

                    switch (options) {
                        case 1: System.out.println("How much would you like to deposit?");          // deposit
                                deposit = in.nextFloat();

                                balance = balance  + deposit;
                                deposit = 0;

                                System.out.println("You have deposited funds into your account.");  // withdraw
                                System.out.println("");
                            break;
                        case 2: System.out.println("How much would you like to withdraw?");
                                withdraw = in.nextFloat();

                                balance = balance - withdraw;
                                withdraw = 0;

                                System.out.println("You have removed funds from your account.");
                                System.out.println("");
                            break;
                        case 3: System.out.println("Logging out...");                               // log out
                                System.out.println("");
                                loggedin = false;
                            break;
                        default:System.out.println("Please enter a valid number");                  // Invalid number
                            break;
                    }
                }while(loggedin = true);

发生的事情是登录，你需要输入一个数字，作为 pincheck，如果它等于现有的 pin，它会让你登录。我可以登录但是当我按 3 登录时out，它打印 logging out，然后打印 welcome，然后整个事情又开始了。谁能指出我卡在哪里？

Answer 1

= 是一个赋值运算符，因此您只是简单地赋值（即设置 loggedin=true），它将始终为 true（因为您设置为 true).

因此，您没有检查循环中的实际条件，因此您需要更正 while 条件，如下所示，它使用 == 运算符（用于计算条件表达式）：

while(loggedin == true); //use == for condition evaluation

陷入循环？

Getting stuck in a loop?

java

loops

login

bank