java语言，输入整数n（n>=0），分别利用for循环、while循环、do…while循环求n！，并调试运行成功

for循环实现：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int result = 1;
        for (int i = 1; i <= n; i++) {
            result *= i;
        }
        System.out.println(n + "! = " + result);
    }
}

while循环实现：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int result = 1;
        int i = 1;
        while (i <= n) {
            result *= i;
            i++;
        }
        System.out.println(n + "! = " + result);
    }
}

do…while循环实现：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int result = 1;
        int i = 1;
        do {
            result *= i;
            i++;
        } while (i <= n);
        System.out.println(n + "! = " + result);
    }
}