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Java write a program to calculate the factorial of any natur

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Java write a program to calculate the factorial of any natural number entered by a user.
import java.util.Scanner;
public class DiGui {
public static void main(String[] args){
//创建一个输入容器
Scanner input = new Scanner(System.in);
System.out.println("输入一个数:");
int grade = input.nextInt();
DiGui d = new DiGui();
int end = d.DiGuiDiaoYong(grade);
System.out.println("阶乘结果:"+end);
}
//用递归
public static int DiGuiDiaoYong(int n){
if(n==1)
return n=1;
return DiGuiDiaoYong(n-1)*n;
}
}