Basics
C++ Variables
Declaring C++ Variables
C++ variables use explicit types with const for immutability.
Introduction to C++ Variables
In C++, variables are fundamental units of storage that hold data which can be manipulated by programs. Each variable in C++ has a specific type, which dictates the kind of data it can store, such as integers, floating-point numbers, characters, etc.
Declaring Variables in C++
To create a variable in C++, you need to specify a type followed by the variable's name. You can also assign an initial value to the variable at the time of declaration.
Here's the basic syntax for declaring a variable:
Variable Initialization
Initialization refers to the process of assigning a value to a variable at the time of its declaration. If a variable is not explicitly initialized, it can contain garbage data.
Example of variable initialization:
Understanding Const Variables
The const keyword is used to make variables immutable, meaning their values cannot be changed once they are initialized. This is useful for defining constants that should not be altered throughout the execution of a program.
Example of using const:
Best Practices for Variable Naming
When naming variables in C++, it is important to use meaningful names that convey the purpose of the variable. Here are some best practices:
- Use descriptive names for variables (e.g.,
totalPrice,userAge). - Follow a consistent naming convention such as camelCase or snake_case.
- Avoid using reserved keywords as variable names.
- Keep variable names concise yet descriptive.
Scope of Variables
The scope of a variable refers to the region of the code where the variable is accessible. In C++, variables can have local scope or global scope:
- Local Scope: Variables declared inside a function or block are only accessible within that function or block.
- Global Scope: Variables declared outside all functions can be accessed by any function within the same file.
Basics
- Previous
- Syntax
- Next
- Data Types
