c++ telescoping constructor is NOT supported until c++11

Telescoping constructor: see Effective Java 2nd Edition Item 2

If you want to use telescoping constructor but your compiler does not support c++11 standards, you can use default parameter instead, see code snippets 'main.cpp', 'Box.h', 'Box.cpp'.

If your compiler supports c++11 standards, the syntax of telescoping is shown in code snippet 'Box2.h' and 'Box2.cpp', and you might need to use '-std=c++11' parameter when you are compiling your source code.

For now, I'd like to use default parameter.

main.cpp

 #include "Box.h"

 int main()
 {
     Box box;
     box.print();
     Box box2();
     box2.print();
     Box box3(, 'A');
     box3.print();
     Box box4(, 'A', 1.88);
     box4.print();
     return ;
 }

Box.h

 #ifndef BOX_H
 #define BOX_H

 class Box
 {
     public:
         Box(const int &_a = , const char &_b = 'M', const double &_c = 0.99);
         ~Box();
         void print();

     private:
         int a;
         char b;
         double c;
 };

 #endif // BOX_H

Box.cpp

 #include "Box.h"

 #include <iostream>

 using namespace std;

 Box::Box(const int &_a, const char &_b, const double &_c)
 : a(_a), b(_b), c(_c)
 {

 }

 Box::~Box()
 {

 }

 void Box::print() {
     cout << "a = " << a << ",b = " << b << ",c = " << c << endl;
 }

Box2.h

 #ifndef BOX_H
 #define BOX_H

 class Box
 {
     public:
         Box(const int &_a, const char &_b, const double &_c);
         Box(const int &_a, const char &_b);
         Box(const int &_a);
         Box();
         ~Box();
         void print();

     private:
         int a;
         char b;
         double c;
 };

 #endif // BOX_H

Box2.cpp

 #include "Box.h"

 #include <iostream>

 using namespace std;

 Box::Box(const int &_a, const char &_b, const double &_c)
 : a(_a), b(_b), c(_c)
 {

 }

 Box::Box(const int &_a, const char &_b)
 : Box(_a, _b, 0.99)
 {

 }

 Box::Box(const int &_a)
 : Box(_a, 'M')
 {

 }

 Box::Box()
 : Box()
 {

 }

 Box::~Box()
 {

 }

 void Box::print() {
     cout << "a = " << a << ",b = " << b << ",c = " << c << endl;
 }