Dynamic Initialization of Variables in C++

How to Initialization of Variables in C++?

Initialization of variables during the run time is called dynamic initialization of variables. In C++, a variable can be initialized at run time using expressions at the place of declaration. For example, the following are valid initialization statements.

int i;

cin>>i;

float avg=i/10;

The variable avg is initialized only during run time, because the value of i is available during run time only.  Thus both the declaration and initialization of a variable can be done simultaneously at the place where the variable is used for the first time. The following two statements in the example

float average;

average = sum/i;         //declare where it is necessary

can be combined into a single statement:

float average = sum / i;                      // initialize dynamically at run time

dynamic initialization is extensively used in object-oriented programming.