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求n的階乘(for迴圈版)

package hello;

import java.util.Scanner;

public class Hello {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n;
        n=in.nextInt();
        int i=1,sum=1;
        for(i=1;i<=n;i++)
        {
            sum=sum*i;
        }
        System.out
.print(sum); } }