Variables Recap

In this lesson we learned the basic concepts of working with variables in C++:

1. Variables are used to store data in a program and we can change them at any time.
2. Every variable must have a declared data type that determines what values it can contain.
3. Basic data types are:
   • int for whole numbers
   • double and float for decimal numbers
   • char for individual characters
   • bool for boolean values
   • string for text
4. We can declare and initialize a variable separately or at once.
5. For printing variables we use std::cout and the << operator.
6. Variable names must start with a letter or underscore and cannot contain spaces.