字符串while循環部分2

Question

我已經問類似的問題之前：String while loop，但現在我還有一個問題，我想不通......

double bill = 0.0; 
double tip = 0.0; 

// Taking an input 
System.out.print("Please enter the total amount of your bill > "); 
String strBill = scan.nextLine(); 
boolean validatedBill = false; 

    // Validating Bill 
    while(!validatedBill) { 
    try { 
     bill = Double.parseDouble(strBill); 
     validatedBill = true; 
    } catch(NumberFormatException e) { 
     System.out.print("Enter a valid number > "); 
     strBill = scan.nextLine(); 
    } // end of catch block 
    } // end of while loop 

    while(bill < 0) { 
    System.out.print("Your bill amount is less then 0, try again > "); 
    bill = scan.nextDouble(); 
    } // end of while loop 

    System.out.print("Please enter the tip percentage > "); 
    String strTip = scan.nextLine(); 
    boolean validatedTip = false; 

    // Validating Tip 
    while(!validatedTip) { 
     try { 
     tip = Double.parseDouble(strTip); 
     validatedTip = true; 
     } catch(NumberFormatException e) { 
     System.out.print("Enter a valid tip percentage > "); 
     strTip = scan.nextLine(); 
     } // end of catch block 
    } // end of while loop 

    while(tip < 0) { 
     System.out.print("Your tip is below 0, try again > "); 
     tip = scan.nextDouble(); 
    } // end of while loop 

我輸入運行完美，但是當程序要求我輸入我的小費百分比，它讓我這樣說：

請所有一行進入尖百分比>輸入有效的尖端百分比>

但與此同時它正常工作和程序可以驗證字符串和數字。

的代碼應該以這種方式工作： 1.請輸入您的賬單總金額> 2.請輸入尖端百分比>

非常感謝！

固定碼

double bill = 0.0; 
double tip = 0.0; 

// Taking an input 
System.out.print("Please enter the total amount of your bill > "); 
String strBill = scan.nextLine(); 
boolean validatedBill = false; 

    // Validating Bill 
    while(!validatedBill) { 
    try { 
     bill = Double.parseDouble(strBill); 
     validatedBill = true; 
    } catch(NumberFormatException e) { 
     System.out.print("Enter a valid number > "); 
     strBill = scan.nextLine(); 
    } // end of catch block 
    } // end of while loop 

    while(bill < 0) { 
    System.out.print("Your bill amount is less then 0, try again > "); 
    bill = scan.nextDouble(); 
    } // end of while loop 
    scan.nextLine(); 
    System.out.print("Please enter the tip percentage > "); 
    String strTip = scan.nextLine(); 
    boolean validatedTip = false; 

    // Validating Tip 
    while(!validatedTip) { 
     try { 
     tip = Double.parseDouble(strTip); 
     validatedTip = true; 
     } catch(NumberFormatException e) { 
     System.out.print("Enter a valid tip percentage > "); 
     strTip = scan.nextLine(); 
     } // end of catch block 
    } // end of while loop 

    while(tip < 0 || tip > bill) { 
     System.out.print("Your tip is less then 0 or greater then your bill, try again > "); 
     tip = scan.nextDouble(); 
    } // end of while loop 

Answer 1

你試圖做

System.out.println("Please enter the tip percentage > "); 

這末自動添加一個換行符。

或者，你可以做。在System.out.println()

或者您完整的代碼

System.out.print("Please enter the total amount of your bill > \n"); 
String strBill = scan.nextLine(); 
boolean validatedBill = false; 

    // Validating Bill 
    while(!validatedBill) { 
    try { 
     bill = Double.parseDouble(strBill); 
     validatedBill = true; 
    } catch(NumberFormatException e) { 
     System.out.print("Enter a valid number > \n"); 
     strBill = scan.nextLine(); 
    } // end of catch block 
    } // end of while loop 

更多信息：

double bill = 0.0; 
double tip = 0.0; 

// Taking an input 
System.out.println("Please enter the total amount of your bill > "); 
String strBill = scan.nextLine(); 
boolean validatedBill = false; 

    // Validating Bill 
    while(!validatedBill) { 
    try { 
     bill = Double.parseDouble(strBill); 
     validatedBill = true; 
    } catch(NumberFormatException e) { 
     System.out.println("Enter a valid number > "); 
     strBill = scan.nextLine(); 
    } // end of catch block 
    } // end of while loop 

    while(bill < 0) { 
    System.out.println("Your bill amount is less then 0, try again > "); 
    bill = scan.nextDouble(); 
    } // end of while loop 

    System.out.println("Please enter the tip percentage > "); 
    String strTip = scan.nextLine(); 
    boolean validatedTip = false; 

    // Validating Tip 
    while(!validatedTip) { 
     try { 
     tip = Double.parseDouble(strTip); 
     validatedTip = true; 
     } catch(NumberFormatException e) { 
     System.out.println("Enter a valid tip percentage > "); 
     strTip = scan.nextLine(); 
     } // end of catch block 
    } // end of while loop 

    while(tip < 0) { 
     System.out.println("Your tip is below 0, try again > "); 
     tip = scan.nextDouble(); 
    } // end of while loop