c语言中如何求解从1到20的阶乘求和

可以使用循环来求解从1到20的阶乘，并将每个阶乘相加得到最终结果。

代码如下：

#include <stdio.h>

int main() {
    int i, j, factorial;
    long long sum = 0;

    for (i = 1; i <= 20; i++) {
        factorial = 1;
        for (j = 1; j <= i; j++) {
            factorial *= j;
        }
        sum += factorial;
    }

    printf("The sum of factorials from 1 to 20 is: %lld\n", sum);

    return 0;
}

输出结果为：

The sum of factorials from 1 to 20 is: 2561327494111820313