else 处的语法错误，删除此标记答案

【问题标题】：Syntax error at else, delete this tokenelse 处的语法错误，删除此标记
【发布时间】：2013-06-28 05:25:27
【问题描述】：

import java.util.Scanner;
public class Menu {

    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in); 
        int choice, quantity;
        double price = 0;  
        double studentprice = 0;
        double totalamt = 0;
        String option,student;
        char option1, studentChar;

        do{

        System.out.println("menu");
        System.out.println("====");

        System.out.println("1. Hamburger");
        System.out.println("2. CheeseBurger");
        System.out.println("3. FrenchFries");
        System.out.println("4. SoftDrinks");

        System.out.print("Enter your choice (1,2,3 or 4):");
        choice = sc.nextInt();

        if(choice ==1)
            price = 1.5;
        else if (choice ==2)
            price = 2;
        else if (choice ==3)
            price = 2.4;
        else if (choice ==4)
        price= 1.95;

        System.out.print("Enter the quantity of your order:");
        quantity = sc.nextInt();

        totalamt += price * quantity ;
        sc.nextLine();


        System.out.print("Do you want to continue? (yes/no)?");
        option = sc.next();
        option1 = option.charAt(0);

        System.out.println("");

        }

        while(option1 == 'y');
        System.out.print("Are you a student? (yes/no?)");
        student = sc.next();
        studentChar = student.charAt(0);

        if(studentChar == 'y')
        studentprice = totalamt * 0.9;
        System.out.print("$ " + studentprice + " is the price you have to pay " );

        **else**(studentChar == 'n')
        studentprice = price;
        System.out.print("$ " + price + " is the price you have to pay " ); 
    }


}`

最后一个else有错误。它在 else 处显示语法错误，请删除此标记。请帮忙！当我添加 do while 时，它打印为零。 -填充剂填充剂填充剂填充剂填充剂-

谢谢！ :)

【问题讨论】：

“else”后面不能有 ()。只有在“如果”之后。我想 ** 不在您要编译的真实代码中。和“而（选项1 =='y'）;”对我来说似乎毫无意义（它甚至可以运行吗？）
不，这些实际上是我要指出的
是的，我可以运行 while(option1 == 'y') 我已经尝试删除 else 后面的 ()。每当我输入 else 时，它总是说这是一个语法错误

标签： java if-statement

【解决方案1】：

语法不正确。当您在if-block 下有多个语句时，您应该使用括号，否则只有第一个语句将在if-block 中处理，其他语句将不属于if-block。

在这种情况下，else 语句没有if，因为if-block 在studentprice = totalamt * 0.9; 行之后完成。

if(studentChar == 'y'){
    studentprice = totalamt * 0.9;
    System.out.print("$ " + studentprice + " is the price you have to pay " );
}else(studentChar == 'n'){
    studentprice = price;
    System.out.print("$ " + price + " is the price you have to pay " ); 

}

【讨论】：

你的循环只会在按下“Y”时退出，我不认为这是有意的。
你可能会写，但这超出了范围，我可以看到这段代码需要进行某些其他更改。

【解决方案2】：

错误就在这里，它应该是else if

  **else**(studentChar == 'n')
studentprice = price;

应该是

if(studentChar == 'y'){
        studentprice = totalamt * 0.9;
        System.out.print("$ " + studentprice + " is the price you have to pay " );
        }
        else if(studentChar == 'n'){
        studentprice = price;
        System.out.print("$ " + price + " is the price you have to pay " ); 
        }else{


    }

【讨论】：

@user2530571 很高兴为您提供帮助。

【解决方案3】：

studentChar = 0;
while(studentChar  != 'y' && studentChar  != 'n')
{
    System.out.print("Are you a student? (yes/no?)");
    student = sc.next();
    studentChar = student.charAt(0);
}

    if(studentChar == 'y')
    {
        studentprice = totalamt * 0.9;
        System.out.print("$ " + studentprice + " is the price you have to pay " );
    }
    else if(studentChar == 'n')
    {
        studentprice = price;
        System.out.print("$ " + price + " is the price you have to pay " ); 
    }

【讨论】：

测试一下。如果用户输入了无效的内容，例如“x”，它将继续。
你在哪里改变了你的选项1...然后

【解决方案4】：

我对您的代码感到困惑。你是如何用

编译这段代码的

else(studentChar == 'n')

你不能用 else 检查条件，你必须使用 if 来检查

导入 java.util.Scanner;

公共类菜单{

public static void main(String[] args)
{
    Scanner sc = new Scanner(System.in);
    int choice, quantity;
    double price = 0;
    double studentprice = 0;
    double totalamt = 0;
    String option,student;
    char option1, studentChar;

    do{

        System.out.println("menu");
        System.out.println("====");

        System.out.println("1. Hamburger");
        System.out.println("2. CheeseBurger");
        System.out.println("3. FrenchFries");
        System.out.println("4. SoftDrinks");

        System.out.print("Enter your choice (1,2,3 or 4):");
        choice = sc.nextInt();

        if(choice ==1)
            price = 1.5;
        else if (choice ==2)
            price = 2;
        else if (choice ==3)
            price = 2.4;
        else if (choice ==4)
            price= 1.95;

        System.out.print("Enter the quantity of your order:");
        quantity = sc.nextInt();

        totalamt += price * quantity ;
        sc.nextLine();


        System.out.print("Do you want to continue? (yes/no)?");
        option = sc.next();
        option1 = option.charAt(0);

        System.out.println("");

    }

    while(option1 == 'y');
    System.out.print("Are you a student? (yes/no?)");
    student = sc.next();
    studentChar = student.charAt(0);

    if(studentChar == 'y')
    {
        studentprice = totalamt * 0.9;
        System.out.print("$ " + studentprice + " is the price you have to pay " );
    }
   else if(studentChar == 'n')
   {
       studentprice = price;
       System.out.print("$ " + studentprice + " is the price you have to pay " );

   }
}
}

现在可以使用了

【讨论】：

【解决方案5】：

试试这个

do
{
    System.out.print("Are you a student? (yes/no?)");
    student = sc.next();
    studentChar = student.charAt(0);
} while(studentChar != 'y' && studentChar != 'n');

if(studentChar == 'y')
{
  //do something here
 }
 else if(studentChar == 'n')
 {
  //other statement
  }

【讨论】：