Question

I create a h file, and I wrote

#ifndef MYSTACK_H
#define MYSTACK_H

#include <cstdlib>
#include <cstddef>
#include <iostream>

struct node
{
int value;
node* next;

node(int value, node* next = nullptr)
{
this->value = value;
this->next = next;
}
};

class mystack
{
private:
node* stack_top;
size_t stack_size;

public:
mystack();
mystack(const mystack& x);
~mystack();
mystack& operator=(const mystack& x);
size_t size() const;
bool empty() const;
void clear();
const int& top() const;
void push(int value);
void pop();
void clone(const mystack& x);
};

#endif

how do I write a default constructer for my node structure?

C++

Answer 1

Code

#ifndef MYSTACK_H
#define MYSTACK_H

#include <cstdlib>
#include <cstddef>
#include <iostream>

struct node
{
   int value;
   node* next;
   node()//this is your default constructor
   {
       this->value = 0;
       this->next = nullptr;
   }
   node(int value, node* next = nullptr)
   {
       this->value = value;
       this->next = next;
   }
};

class mystack
{
private:
   node * stack_top;
   size_t stack_size;

public:
   mystack();
   mystack(const mystack& x);
   ~mystack();
   mystack& operator=(const mystack& x);
   size_t size() const;
   bool empty() const;
   void clear();
   const int& top() const;
   void push(int value);
   void pop();
   void clone(const mystack& x);
};

#endif

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