C语言程序设计教程（第三版）课后习题6.4 （Java代码）

解题思路:





注意事项:





参考代码:

import java.util.Scanner;

public class C1014 {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

while (sc.hasNext()) {

int n = sc.nextInt();

long sum = 0, temp = 1;

for(int i = 1; i <= n; i++){

temp = temp*i;

sum += temp;

}

System.out.println(sum);

}

sc.close();

}

}