c语言的方法求s = 1!+2!+3!+4!+...+20! 结果： 2561327494111820300.000000

以下是C语言的代码，用于计算1!+2!+3!+4!+...+20!的结果：

#include <stdio.h>

int main() {
    double sum = 0;
    double factorial = 1;
    for (int i = 1; i <= 20; i++) {
        factorial *= i;
        sum += factorial;
    }
    printf("s = %lf\n", sum);
    return 0;
}

输出结果为：s = 2561327494111820300.000000