Single Value Member Initializer List in C++ Programming

Member initializer list is the place where non-default initialization of these objects can be specified. Initializer list is used to initialize data members. The syntax begins with a colon(:) and then each variable along with its value separated by a comma.

The program starts by including the necessary header files and defining a class Base. The class Base has a private data member x, which is initialized with the value passed as a parameter to the constructor of the class. The class Base also has a member function print(), which prints the value of x to the console.

In the main() function, an object o of class Base is created with an integer value of 25 passed as an argument to its constructor. The print() function of the object o is then called to display the value of x.

The use of a constructor in this program ensures that the private data member x of the class Base is always initialized with a value, which can be useful in preventing uninitialized variables. The program ends by returning 0 from the main() function, indicating that the program ran successfully.

Source Code

//Member Initializer List
//Single Value
#include<iostream>
using namespace std;
class Base
{
private:
    int x;
public:
    Base(int a):x(a){}
    void print(){
    cout<<"X : "<<x<<endl;
    }
};
 
int main()
{
    Base o(25);
    o.print();
    return 0;
}

Output

X : 25

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