Benefits of Using Global Variables
Following are some main benefits that global variables provide:
- Global Variable can be accessed directly by all the functions without passing an argument in the program.
- Global Variables are very useful when many functions access the same variable.
- Global Variable required only a one-time declaration in the program.
C++ Global Variables
Prerequisites: Scope of Variables, Data Types, and Functions in C++
In C++ programming languages, a variable is a name provided to memory to store different data types. Variable values can change anytime while running the program and each variable has its own scope (or region) where it is valid to access the variable using the name given to him.
In programming, variables are not all equal. Their scope, lifespan, and accessibility in the program depend on where and how they are declared. There are two types of variables based on their scope.
- Local variable – The scope of these variables exists only within the block in which the variable is declared. i.e. we can access this variable only within that block.
- Global variable – Global variables are a special type with the widest scope possible. It is declared outside of all of the functions and blocks, at the top of the program. They can be accessed from any portion of the program.
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