import java.util.Scanner;

public class FactorialCalculator{
	public static void main(String[] args){
		Scanner scanner = new Scanner(System.in);
		
		System.out.print("请输入一个非负整数：");
		int n = scanner.nextInt();
		
		int factorial = 1;
		int i = 1;
		
		if (n == 0 || n == 1) {
			factorial = 1;
		}else if (n < 0) {
			System.out.println("负数没有阶乘！");
			scanner.close();
			return;
			
		}else {
			while (i <= n) {
				factorial *= i;
				i++;
			}
		}
		System.out.println(n + " 的阶乘是：" + factorial);
		
		scanner.close();
	}
}

import java.util.Scanner;
public class TheFactorialOfANumber {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.println("请输入一个整数");
        int i = s.nextInt();
        int j = 1;
        int factorail = 1;
        while(j<=i){
            factorail *= j;
            j++;
        }
        System.out.printf("阶乘是%d: ", factorail);
    }
}

public class Main {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        System.out.println("输入数字：");
        int input=scanner.nextInt();
        int num=input;
        while (input>=2){
           num*=--input;
        }
        System.out.println("阶乘:"+num);
    }
}

package com.cwt.study.s_20240419;

import java.util.Scanner;

public class HelloWorld3while {
    /*
    * while和do-while循环语句
    * while	条件为true时 重复执行
    * do while	条件为true时 重复执行，至少会执行一次
    *
    * 练习
    * 通过Scanner 获取一个整数，然后使用while计算这个整数的阶乘
      N的阶乘等于 N* (N-1) * (N-2) * ... * 1*/
    public static void main(String[] args) {
        int i,j=1;
        Scanner in = new Scanner(System.in);
        System.out.println("请输入数字：");
        i = in.nextInt();
        while(i!=0){
            j = j*i;
            i--;
        }
        System.out.println("阶乘是："+j);
    }
}

import java.util.Scanner;

public class ex53 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入一个数");
        int x=sc.nextInt();
        int b=x;
        int sum=1;
        while(x>0){
            sum=sum*x;
            x-=1;
        }
        System.out.println(b+"的阶乘答案是："+sum);
    }

}

import java.util.Scanner;

public class pratice {
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        int x,JC;
        System.out.println("请输入一个整数：");
        x = s.nextInt();
        JC = x;
        while(x>1){
            x -= 1;
            JC *= x;
        }
        System.out.println("阶乘是:"+JC);
    }
}

public class a {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.println("请输入：");
        int a = s.nextInt();
        int i =1;
        int x = a;
        while(x!=i){
            a=a*i;
            i++;
        }
        System.out.println("阶乘是："+a);
    }
}

import java.util.Scanner;
public class HelloWorld {
    public static void main(String[] args) {
       Scanner s = new Scanner(System.in);
        int x = s.nextInt();
        int y = x ;
        while( x>1){
            x--;
            y = y*x;

        }
        System.out.println(y);

        }


    }

package One;

import java.util.Scanner;

public class Session5 {
	public void bN() {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int c= 1;
		long b =a;
		while(c<a) {
			b*=(a-c);
			c++;
		}
		System.out.println(b);
	}
	public void aN() {
		while(true) {
			Scanner sc = new Scanner(System.in);
			try {
			long sum=1;
			int a = sc.nextInt();
			while(a>0) {
				sum*=a;
				a--;
			}
			System.out.println(sum);	
				
			} catch (Exception e) {
				// TODO: handle exception
			}
		}
	}
		public static void main(String[] args) {
			Session5 v1 = new Session5();
			v1.bN();
			}
}

import  java.util.Scanner;
public class HelloWorld {
    public static void main(String[] args) {
    	  Scanner input=new Scanner(System.in);
    		System.out.println("请输入一个整数:");
    		float a=input.nextFloat();
        int i =1;
        while (a >1){
            i = (int)(a *i);
            a --;
        }
        System.out.println("这个数的阶乘"+ i);
    }
 
}

import  java.util.Scanner;
//计算阶乘
public class Nc2 {
    public static void main(String[] args) {
        //打印
        Scanner s = new Scanner(System.in);
          int a = s.nextInt();
        System.out.println("请输入一个数" +a);

        int i =1;
        while (a >1){
            i = a *i;
            a --;

        }
        System.out.println("这个数的阶乘"+ i);
    }

}

Scanner t = new Scanner(System.in);
            int x = t.nextInt();
            int a =1;
            int b =x;
            while (a<x){
                b*=(x-a);
                a++;
            }
            System.out.println(b);

import java.util.Scanner;

public class test4 {
    public static void main(String[] args) {
        Scanner se=new Scanner(System.in);
        System.out.print("请输入");
        int in= se.nextInt();
        long a=1;
        int b=1;
        while(in>=b){
            a=a*b;
            b++;
        }
        System.out.println("阶乘为"+a);
    }
}

package chapter02;
//计算一个整数的阶乘
import  java.util.Scanner;
public class jiechen {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        int in=scanner.nextInt();
        int sum=1;
        while(in>1)
        {
         sum=sum*in;
         in--;
        }
        System.out.println(sum);
    }
}

import java.util.Scanner;

public class HelloWorld_char {
	public static void main(String[] args) {
		Scanner o = new Scanner(System.in);
		int d = o.nextInt();
		int r = 1;
		int fact = 1;
		while (r <= d) {
			fact *= r;
			r++;
			System.out.println(fact);
		}
		System.out.println(fact);
	}
}

public class Factorial {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);//导包
        int a = sc.nextInt();//声明一个输入对象
        int factorrial=1;//声明阶乘并初始化
        for (int i = 0; i <a ; i++) {//从0开始循环，到输入的数字结束
            factorrial*=a-i;//阶乘 = 阶乘 * 输入值-长度
        }
        System.out.println("阶乘是"+factorrial);
    }
}

public class factorial {
    public static void main(String[] args) {
        System.out.println("请输入要阶乘的整数数字：");
        Scanner n = new Scanner(System.in);
        int number= n.nextInt();
        if (number>=0){
        int f = 1;
        while (number>1){
            f=f*number;
            number--;
        }
        System.out.println("阶乘是："+f);
    }else
            System.out.println("输入的数字有误");
}
}

Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();

        int i=1;
        while (num!=0){
            i*=num;
            num--;
        }
        System.out.println("阶乘:"+i);

//N的阶乘等于 N* (N-1) * (N-2) * ... * 1
        //通过Scanner 获取一个整数，然后使用while计算这个整数的阶乘
        Scanner s = new Scanner(System.in);
		int n = s.nextInt();
		int product = n;
		while(n > 1){ 
            n--;
			product = product * n;
        } 
        System.out.println(product);

public class Test {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个数字：");
        int Num = sc.nextInt();
        int Temp = Num;
        int i = 1;
        while (i<Num){
            Temp *= Num-i;
            i++;
        }
        System.out.println("您输入的数字是："+Num+"，它的乘阶是："+Temp);
    }
}

import java.util.Scanner;
public class Xunhuan{
	long sum=1;
	int a = 1;
	void jiecheng(int s){
		while(a<=s)
		{
			sum=sum*a;
			a++;
		}
	System.out.println(sum);
	}
	public static void main(String[] args){
		Xunhuan data = new Xunhuan();
		System.out.println("请输入一个数：");
		Scanner input = new Scanner(System.in);
		int num = input.nextInt();
		data.jiecheng(num);
		input.close();
	}
}

package src;
import java.util.Scanner;
public class jiecheng {
	public void jiecheng(int i){
		int s=1;
		do {
			s=s*i;
			i--;
		}while(i>1);
		System.out.println("阶乘是："+s);
	}
	public static void main(String[] args) {
		jiecheng data = new jiecheng();
		System.out.println("请输入一个整数：");
		Scanner s = new Scanner(System.in);
		int a =s.nextInt();
		data.jiecheng(a);
	}
}

public static void main(String[] args) {
        System.out.println("请输入一个整数：");
        Scanner scanner=new Scanner(System.in);
        int number=scanner.nextInt();
        int i=1,sum=1;
        while(i<number){
            sum*=(i+1);
            i++;
        }
        System.out.println("这个整数的阶乘："+sum);
    }