in class member initialization c++11

In class member initializers: As the name suggests that we can initialize the data members in the class declaration. Example:

class test
{
int m_a{1};
int m_b=2;
};

source code with example:

/*
Program: In class initialization 
Author: Alpha Master
Date: 10 March 2021
*/

//Header File
#include<iostream>

class test
{
int m_a{1};
int m_b=2;
public:
void display()
{
    std::cout<<"A:"<<m_a<<" B:"<<m_b<<std::endl;
}
};

int main()
{
    std::cout<<"In Class Intialization"<<std::endl;
    test obj1;
    obj1.display();
    return 0;
}

Output:

In Class Intialization
A:1 B:2