List add, C++ (gcc)

List add

//Title of this code

#include <iostream>

using namespace std;

struct node {
    int num;
    node* next;
    
    node(int num, node* next) {
        this->num = num;
        this->next = next;
    }  
};

inline int pow_of_ten(int x) {
    int r = 1;
    for (int i = 0; i < x; ++i)
        r *= 10;
    return r;
}

int node_to_num(node *n) {
    const int max_num = 8;
    int num = 0;
    
    int i = max_num;
    node *cur = n;
    while (cur) {
        num += cur->num * pow_of_ten(i--);
        cur = cur->next;
    }
    
    num /= pow_of_ten(i + 1);
    
    return num;  
}

node* node_add(node* n1, node* n2) {
 
    int num1 = node_to_num(n1);
    int num2 = node_to_num(n2);
    
    num1 += num2;
    
    
    node *n = NULL;
    
    while (num1 > 0) {
        n = new node(num1 % 10, n);
        num1 /= 10;
    }
    
    return n;
}

int main()
{
    node *n1 = new node(9, new node(8, new node(7, NULL)));
    node *n2 = new node(2, new node(3, new node(4, NULL)));
    
    node *n = node_add(n1, n2);
    
    cout << node_to_num(n);
    
}


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