Bad code, C++ (gcc)

Bad code

//Title of this code

#include <iostream>
using namespace std;

struct Node {
    Node *next;
    int e;
    
    Node(Node *p, int n): next(p), e(n) {}
};

void rev(Node *first, int k) {
    Node *cur, *tmp, *tmp2, *tmp3;
    
    cur = first;
    while (cur != NULL) {
        
        int i = k;
        tmp = cur;
        
        while (i > 0) {
            tmp2 = cur;
            cur = cur->next;
            if (!cur)
                break;
            --i;
            
            tmp3 = cur;
            cur->next = tmp2;
            cur = tmp3;
        }
        
        if (i == 0) {
            
            
        }
        
    }
    
    
}

void print(Node *first) {

while (first != NULL) {
        cout << first->e << " ";
        first = first->next;
    }
    cout << endl;
}

int main()
{
    //Node *first = new Node(new Node(new Node(new Node(new Node(new Node(new Node(NULL, 7), 6), 5), 4), 3), 2), 1);
    Node *first = new Node(new Node(new Node(NULL, 3), 2), 1);
    //rev(first, 3);
    
    print(first);
    cout << "Hello, world!\n";
}


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