java阶乘赋值有问题

Question

有人能帮助我的java阶乘赋值吗？我认为我做得对，但我不确定。我需要让用户输入一个数字，然后计算输入数字的阶乘。就像人输入10一样，用户会将此视为输出：0! = 1, 1! = 1, 2! = 2, 3! = 6, 4! = 24, 5! = 120, 6! = 720, 7! = 5040, 8! = 40320, 9! = 362880

import java.lang.Math;
import java.util.Scanner;

public class Factorial {

public static int factorial( int iNo ) {
    if (iNo < 0) throw
        new IllegalArgumentException("iNo must be >= 0");

    int factorial = 1;
    for(int i = 2 ; i <= iNo; i++)
        factorial *= i;
    System.out.println ( i + "! = " + factorial(i));

    return factorial ;
}
}
public class Factorial{
    public static void main ( String args[] ){
        Scanner input = new Scanner (System.in);
        System.out.println("Enter number of factorials to calculate: " );
        int  iNo = input.nextInt();
        for(int i = 0; i <= iNo; i++)
        factorial *= i;
        System.out.println ( i + "! = " + factorial(i));


}
}

Answer 1

这很好，但您不需要。

import java.lang.Math;

    public class Factorial {



    public static int factorial( int iNo ) {

        // Make sure that the input argument is positive

        if (iNo < 0) throw
            new IllegalArgumentException("iNo must be >= 0");

        // Use simple look to compute factorial....

        int factorial = 1;
        for(int i = 2; i <= iNo; i++)
            factorial *= i;

        return factorial;
    }


    public static void main ( String args[] ) {




    }

Answer 2

你就快到了。您的主代码中缺少一些代码：

1. 提示用户输入数字。您可以使用系统。出来println

一旦你完成了上面的四个步骤，你就大功告成了！