Initialize member variables with multiple constructor calls - c++

Question

I'm trying to execute the following code:
#include <iostream>
using namespace std;
class ABC {
private:
int x, y;
public:
ABC(){
cout << "Default constructor called!" << endl;
ABC(2, 3);
cout << x << " " << y << endl;
}
ABC(int i, int j){
cout << "Parameterized constructor called with parameters "<< i << " " << j << "!" << endl;
x = i;
y = j;
cout << x << " " << y << endl;
}
};
int main(){
ABC a;
return 0;
}
I am getting the following output:
Default constructor called!
Parameterized constructor called with parameters 2 3!
2 3
-858993460 -858993460
Shouldn't the member variables be initialized with values 2 and 3?

Answer 1

ABC(2, 3); doesn't call the constructor to initialize the members, it just create a temporary variable which will be destroyed immediately.
If you meant delegating constructor you should:
ABC() : ABC(2, 3) {
cout << "Default constructor called!" << endl;
cout << x << " " << y << endl;
}
Note this is a C++11 feature. You can add a member function if you can't use C++11.
class ABC {
private:
int x, y;
init(int i, int j) {
x = i;
y = j;
}
public:
ABC(){
cout << "Default constructor called!" << endl;
init(2, 3);
cout << x << " " << y << endl;
}
ABC(int i, int j){
cout << "Parameterized constructor called with parameters "<< i << " " << j << "!" << endl;
init(i, j);
cout << x << " " << y << endl;
}
};

Answer 2

You create a temporary variable in ABC() body. You can use this syntax to overcome this:
class ABC
{
private:
int x, y;
public:
ABC() : ABC(2,3)
{
std::cout << "Default constructor called!" << std::endl;
}
ABC(int i, int j)
{
std::cout << "Parameterized constructor called with parameters "<< i << " " << j << "!" << std::endl;
x = i;
y = j;
std::cout << x << " " << y << std::endl;
}
};