c预言实现编写函数求n!，主函数通过调用函数实现sum=1!+2!+…n!(n由键盘输入)

#include <stdio.h>

int factorial(int n) {
    int result = 1;
    for (int i = 1; i <= n; i++) {
        result *= i;
    }
    return result;
}

int main() {
    int n, sum = 0;
    printf("Enter n: ");
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) {
        sum += factorial(i);
    }
    printf("Sum is %d", sum);
    return 0;
}