字符串while循环部分2

Question

我已经问类似的问题之前：String while loop，但现在我还有一个问题，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 

我输入运行完美，但是当程序要求我输入我的小费百分比，它让我这样说：

请所有一行进入尖百分比>输入有效的尖端百分比>

但与此同时它正常工作和程序可以验证字符串和数字。

的代码应该以这种方式工作： 1.请输入您的账单总金额> 2.请输入尖端百分比>

非常感谢！

固定码

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

你试图做

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

这末自动添加一个换行符。

或者，你可以做。在System.out.println()

或者您完整的代码

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