博客

package com.atrrx.java2023_3_14;

public class JiChengTest {
    public static void main(String[] args) {
        System.out.println("第一种方法：单层循环");
        int sum=0,cheng=1;
        for (int i = 1; i <=10; i++) {
            cheng*=i;
            sum+=cheng;
        }
        System.out.println(sum);
        System.out.println("*****************************");

        System.out.println("第二种方法：双层循环");
        int sum1=0,cheng1=1;
        for (int i = 1; i <=10; i++) {
            cheng1=1;
            for (int j = 1; j <= i; j++) {
                cheng1*=j;
            }
            sum1+=cheng1;
        }
        System.out.println(sum1);
//        1!+2!+3!+...+10!的阶乘和是：4037913（答案）
    }
}