Find the sum of n levels 1 in C language! +2! +3! +…+ n!

16963001:

It’s relatively simple so I won’t elaborate too much. Some details have been noted.

#include<stdio.h>
int main()
{
	int n = 0;
	int b = 1;
	int c = 1;
	int d = 0;
	printf("输入所需数字:");
	scanf("%d", &n);
	//第一个变量为了选择所需的阶层次数的和
	for (b = 1; b <= n; b++)
	{
		c *= b;//c * b 算出阶层 ，再放到c里
		d += c;//加上每个阶层c
	}
	printf("%d", d);//最终打印d阶层的和
	
	return 0;
}

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