How can I define constructor when the class member parameters have the same name?

Question

class MyStrValArray
{
private:
   vector<char> p;
public:
   MyStrValArray(const int n = 10, const int i = 1, const char ch = 'a')
   {}
   ~MyStrValArray();
   void init(const int n);
   void clear();
   unsigned capacity();
   unsigned size();
   char get(const int i);
   void set(const char ch, const int i);
   void remove(const unsigned int i);
   void pushData(const char ch);
   char showData();
};

This is the class I wrote. Some of the class member functions have the same parameter name, for example, ch , i . In this case, how can I define a constructor when the class member parameters have the same name?

+) I wanted to check whether the constructor well defined, so in the main function, I wrote p2.init() , without any parameter. Like this:

    MyStrValArray p2;
    p2.init();

init function looks like this:

void MyStrValArray::init(const int n) //Done
{
   p.reserve(n);
   cout << "a vector with size " << n << " created" << endl;
}

and I got this message:

error: no matching function for call to 'MyStrValArray::init()'| 

I also wrote:

p2.get();
p2.set();

char MyStrValArray::get(const int i)
{
   return p.at(i);
}

void MyStrValArray::set(const char ch, const int i)
{
   p[i] = ch;
   cout << "p[" << i << "]" << "changed to " << ch << endl;
}

And p2.get() , p2.set() also have the same error.

What could be the problem?

Answer 1

You declared and defined the init function with an int eger argument

class MyStrValArray
{
 public:
       void init(const int n);
       // ...
}

void MyStrValArray::init(const int n)
//                       ^^^^^^^^^^^^ --> argument n
{
   // ...code
}

that means the calling the function will only work with passing with an argument. You should be doing

 MyStrValArray p2;
 p2.init(3); // pass the `n`

---

If you intend to call without any arguments, you should provide a default argument to it

class MyStrValArray
{
 public:           
      void (const int n = 3); // declaration: provide the default argument
      //    ^^^^^^^^^^^^^^^^
      // ...
}

void MyStrValArray::init(const int n) // definition
{
    // ...code
}

Now you could

 MyStrValArray p2;
 p2.init(); // the n = 3

---

" error: no matching function for call to 'MyStrValArray::get()'| ". What could be the problem?

The above mentioned is applied for the case of MyStrValArray::get() function too. Hence the error. Choose one of the mentioned ways to get around the problem.