c++ 递归入门 阶乘/数组求和

阶乘

int factorial(int num) {
    if (num == 1) {
        return 1;
    }
    return num * factorial(num - 1);
}

数组求和

int arraySum(int* arr, int length, int index) {
    if (index == length) {
        return 0;
    }
    return arr[index] + arraySum(arr, length, index + 1);
}

来源：https://www.cnblogs.com/esrevinud/p/11980275.html