Question

我有以下程序应该运行，但事实并非如此。教授给了我们合作。它旨在计算阶乘。它甚至不让我编译。我得到错误的错误

  Multiple markers at this line
     - Syntax error on token "Invalid Character", invalid Expression
     - Syntax error on tokens, delete these tokens

这是参考以下一行：

 System.out.print ( “%d! = %d\n”, counter, factorial (counter ));

我该如何解决这个问题？我以前写过很多程序，但我之前从未见过模数运算符。我有点困惑！整个计划发布在下面！谢谢！

public class FactorialTest
{
    // calculate the factorial of 0 – 15
    public static void main ( String args[] )
    {
        FactorialCalculation factorialCalculation = new FactorialCalculation();
        factorialCalculation.displayFactorials();
    }  // end of main
}  // end of the class FactorialTest


public class FactorialCalculation
{
    //recursive Factorial method
    public long factorial(long number)
    {
        if (number  <= 1)
            return 1;
        else
            return number * factorial (number - 1);
    }
    //Now output the factorials of 0 through 15
    public void displayFactorials()
    {
        // Calculate the factorial of o through 15
        for ( int counter = 0; counter <= 10; counter++ )
            System.out.print ( “%d! = %d\n”, counter, factorial (counter ));
    } // end of the method displayFactorials
}  // end of class FactorialCalculation

Answer 1

你有这个：

“%d! = %d\n”

“和”花哨的引号字符在Java中不是有效的引号字符。使用普通的旧“而不是。

如果您的编辑器自动为您创建精美的引号，请禁用它或找到更合适的编辑器。

Answer 2

您需要替换fancy curly braces，并且还需要使用printf格式化字符串以获得您期望的输出。

public class FactorialTest {
    // calculate the factorial of 0 – 15
    public static void main(String args[]) {
        FactorialCalculation factorialCalculation = new FactorialCalculation();
        factorialCalculation.displayFactorials();
    }  // end of main
}  // end of the class FactorialTest


class FactorialCalculation {
    //recursive Factorial method
    public long factorial(long number) {
        if (number <= 1)
            return 1;
        else
            return number * factorial(number - 1);
    }

    //Now output the factorials of 0 through 15
    public void displayFactorials() {
        // Calculate the factorial of o through 15
        for (int counter = 0; counter <= 10; counter++) {
            System.out.printf("%s! = %s\n", counter, factorial(counter));
        }
    } // end of the method displayFactorials
}

注意：您无需为public课程定义FactorialCalculation。编译器尚未强制执行此限制，但有效的包导入是必要的。

我们只能有一个顶级公共任何类或接口 java编译单元（.java源文件）

递归程序错误

2 个答案: