Variable Initialization

Variable Initialization

Variable is a location in the computer memory which can store data and is given a symbolic name for easy reference. The variables can be used to hold different values at different times during the execution of a program.

Declaration of a variable

Before a variable is used in a program, we must declare it. This activity enables the compiler to make available the appropriate type of location in the memory. 

float total;

You can declare more than one variable of same type in a single single statement

int x, y;

Initialization of variable

When we declare a variable it's default value is undetermined. We can declare a variable with some initial value. 

int a = 20;

The other way to initialize variables, known as constructor initialization, is done by enclosing the initial value between parentheses () :
For example:

int a (0);

Both ways of initializing variables are equivalent in C++.