在十進制格式中使用'\ n'和'\ t'轉義序列？

Question

我的在線編程課的任務是寫一個簡短的程序來計算餐廳的賬單。這個餐館賬單應該顯示稅前（補足你自己的金額）的餐費，協調銷售稅（13％）以及包括稅費在內的餐費。我決定添加提示以添加更多細節。

程序的輸出應格式化爲2位小數。我應該使用/ n和/ t轉義序列？我要使用哪些代碼以及我將它放在哪裏？

這裏是我的代碼：

public static void main(String[] args) { 


    double mealCharge; 
    double tax; 
    double tip; 
    double total; 

      try ( 
       Scanner keyboard = new Scanner(System.in)) { 

      System.out.print("Enter the charge for the meal: "); 
      mealCharge = keyboard.nextDouble(); 

      DecimalFormat df = new DecimalFormat("\"%.2f"); 


      // Calculate the tax. 
      tax = calculateTax (mealCharge); 


      // Calculate the tip. 
      tip = calculateTip (mealCharge); 

      // Calculate the total. 
      total = calculateTotal (mealCharge, tax, tip); 

      // Display the results. 
      System.out.println("Meal Charge:................... $" + mealCharge); 
      System.out.println("Tax:............................$" + tax); 
      System.out.println("Tip:............................$" + tip); 
      System.out.println("Total:..........................$" + total); 


     } 
} 



static double calculateTax (double mealCharge) { 
    return mealCharge * TAX_RATE; 
} 


static double calculateTip (double mealCharge) { 
    return mealCharge * TIP_PERCENT; 
} 


static double calculateTotal (double mealCharge, double tax, double tip) { 
    return mealCharge + tax + tip; 
} 

}

Answer 1

嘗試的System.out.println（的String.format（「膳費：.............. ..... $％。2f「，mealCharge））;