list multiply, C++ (vc++)

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//Title of this code

#include <iostream>

using namespace std;

struct node {
    int data;
    node* next;
    
    node(int d, node* n): data(d), next(n) {}
};

1 -> 7 -> 3 -> NULL  -   378
9 -> 8 -> NULL       -    89

node* multiply(node* head1, node* head2) {
    
    int carry = 0;
    
    node* res;
    
    node* num1 = head1;
    while (num1) {

node* num2 = head2;
        while (num2) {
        
            int num = carry + (num1->data * num2->data);
            if (num > 9) {
                carry = num / 10;
                num = num % 10;
            } else
                carry = 0;
            
            
            cout << num << " ";
            
            //if (num){}
            
            num2 = num2->next;
            
        }
        
        num1 = num1->next;
        
        cout << endl;
    }
 
    return NULL;
}

int length(node* head) {
    int i = 0;
    while (head) {
        ++i;
        head = head->next;
    }
    
    return i;
}

int main()
{
    node* num1 = new node(1, new node(2, new node(3, NULL)));
    node* num2 = new node(1, new node(1, NULL));

multiply(num2, num1);
    
    std::cout << "Hello, world!\n";
}

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Compilation time: 1.06 sec, absolute running time: 0.05 sec, absolute service time: 1.11 sec