Can one constructor of a class call another constructor of the same class to initialize this object?

Answer:

Onward C++11  Yes, let see an example,

#include <iostream>
using namespace std;
class Test
{
    int a, b;
public:
    Test(int x, int y)
    {
        a= x;
        b =y;
    }
    Test(int y) : Test( 7, y) {}
    void displayXY()
    {
        cout <<"a = "<<a<<endl;
        cout <<"b = "<<b<<endl;
    }
};
int main()
{
    Test obj(27);
    obj.displayXY();
    return 0;
}

Output:

a = 7
b = 27

Note: Using some tricks you can also do in C++03. If you want to know how or know the answer then please write in the comment box.