一加到20的阶乘求和C语言

#include <stdio.h>

int main() {
int sum = 0;
int factorial = 1;
for (int i = 1; i <= 20; i++) {
factorial *= i;
sum += factorial;
}
printf("1!+2!+3!+...+20! = %d", sum);
return 0;
}