using System; namespace 求整数1_n之间整数的阶乘的和_从键盘输入n的值 { class Program { static void Main() { Console.WriteLine("请输入整数n的值:"); int n = int.Parse(Console.ReadLine()); int jc=1; int sum = 0; for (int i = 1; i <=n; i++) { jc*= i; sum += jc; } Console.WriteLine("整数1-{0}之间整数的阶乘的和为{1}",n,sum); Console.ReadKey(); } } }