What is dynamic initialization of object in c

Question

What is dynamic object initialization in C++?

Please provide a basic example...

Answer 1

Dynamic initialization occurs when the initialization value is unknown at compile time. 

To initialise the variable, it is calculated at runtime.

Example,

int factorial(int n)
{
     if ( n < 0 )       return -1; //indicates input error
     else if ( n == 0 ) return 1;
     else               return n * factorial(n-1);
}

int const a = 10 ; //static initialization 
             //10 is known at compile time. Its 10!

int const b = factorial(8); //dynamic initialization 
                      //factorial(8) isn't known at compile time,
                      //rather it's computed at runtime.

That is, static-initialization often includes constant-expression (which is known at compile time), whereas dynamic-initialization typically involves non-constant expression.

static int c;//this is also static initialization (with zero)!