用Java写一个1阶乘到20阶乘之和的代码并且输出答案

public class FactorialSum {
    public static void main(String[] args) {
        long sum = 0;
        long factorial = 1;
        for (int i = 1; i <= 20; i++) {
            factorial *= i;
            sum += factorial;
        }
        System.out.println("1! + 2! + 3! + ... + 20! = " + sum);
    }
}

输出结果为：

1! + 2! + 3! + ... + 20! = 2561327494111820313

相关问题

用Java写一个1阶乘到20阶乘的代码并且输出答案

public class Factorial {
    public static void main(String[] args) {
        for (int i = 1; i <= 20; i++) {
            long factorial = 1;
            for (int j = 1; j <= i; j++) {
                factorial *= j;
            }
            System.out.println(i + "! = " + factorial);
        }
    }
}

输出结果：

1! = 1
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
8! = 40320
9! = 362880
10! = 3628800
11! = 39916800
12! = 479001600
13! = 6227020800
14! = 87178291200
15! = 1307674368000
16! = 20922789888000
17! = 355687428096000
18! = 6402373705728000
19! = 121645100408832000
20! = 2432902008176640000

用java写1到20阶乘的和

可以使用以下代码来计算1到20阶乘的和：

public static void main(String[] args) {
    long sum = 0;
    long factorial = 1;
    for (int i = 1; i <= 20; i++) {
        factorial *= i;
        sum += factorial;
    }
    System.out.println("1到20阶乘的和为：" + sum);
}

输出结果为：2561327494111820313。