C++ Variables C-PLUS-PLUS

Variables are containers for storing data values.

In C++, there are different types of variables (defined with different keywords), for example:

• int - stores integers (whole numbers), without decimals, such as 123 or -123
• double - stores floating point numbers, with decimals, such as 19.99 or -19.99
• char - stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes
• string - stores text, such as "Hello World". String values are surrounded by double quotes
• bool - stores values with two states: true or false

To create a variable, you must specify the type and assign it a value:

Syntax

Where type is one of C++ types (such as int), and variable is the name of the variable (such as x or myName). The equal sign is used to assign values to the variable.

Create a variable called myNum of type int and assign it the value 15:

You can also declare a variable without assigning the value, and assign the value later. 

You can add the const keyword if you don't want to override existing values (this will declare the variable as "constant", which means unchangeable and read-only).

You can't change the value of constants during the program. You just can define its value at once during declaration.