陷入循環？

Question

我正在爲一個項目製作一個銀行機器代碼，並且無論何時登錄都會報錯。這是做它的代碼的部分是這樣的：

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); 

正在發生的事情是登錄在你需要把一個號碼，pincheck，如果它等於存在，它會記錄該引腳你可以登錄，但是當我按3登出時，它會打印登出並打印歡迎信息，整個事情再次開始。任何人都可以指出我卡住的地方嗎？

Answer 1

=是一個賦值操作符，所以你只是分配值（即，設置loggedin=true），其總是會true（因爲你設置爲true）。

那麼，你是不是檢查循環中的實際情況，所以你需要更正while條件如下圖所示，它使用==運算符（用於評估的條件表達式）：

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