sum=1+2*3+4*5*6+7*8*9*10+…… 共n项，n由键盘输入。求sum.

Question

用C语言

Answer 1

public class Print {
public static void main(String[] args) {
Scanner in = new Scanner (System.in);
System.out.println("输入n:");
int n = in.nextInt();
long sum = 0;
long temp = 1;
int number = 1;
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
temp *= number;
number++;
}
sum += temp;
temp = 1;
}
System.out.println("结果是:");
System.out.println(sum);
}
}

Answer 2

是要自动求和吗?以后提问最好表达清楚一些..

Answer 3

你这是要干什么呢，要用什么语言给你编这个东西