c语言分别用迭代法和递归法编写一个求n!的函数 来求1!+2!+3!+…+10!的值

迭代法实现n!的函数：

#include <stdio.h>

int factorial_iterative(int n) {
    int result = 1;
    for (int i = 2; i <= n; i++) {
        result *= i;
    }
    return result;
}

int main() {
    int sum = 0;
    for (int i = 1; i <= 10; i++) {
        sum += factorial_iterative(i);
    }
    printf("1!+2!+3!+...+10!=%d\n", sum);
    return 0;
}

递归法实现n!的函数：

#include <stdio.h>

int factorial_recursive(int n) {
    if (n == 0 || n == 1) {
        return 1;
    } else {
        return n * factorial_recursive(n - 1);
    }
}

int main() {
    int sum = 0;
    for (int i = 1; i <= 10; i++) {
        sum += factorial_recursive(i);
    }
    printf("1!+2!+3!+...+10!=%d\n", sum);
    return 0;
}