C – Scope of a Variable2 min read

Scope refers to the visibility of variables. In other words, a scope is a section of a program, and the scope of variables refers to the section of the program where the variables are visible. Variable is declared and used within that region. Also, variables declared within the block cannot be accessed outside that block.

Depending on the region, there are three types of scope that are declared and used:

  • Local variables: inside a function or a block.
  • Global variables: outside of all functions.
  • Formal parameters: function parameters.

1. Local Variable:

A variable that is declared within the body of the function or block is called a local variable. This variable is used only within that block or function where it was created, other classes cannot access it. And is destroyed after exiting the block.

The output of Local variable in C:


2. Global Variable:

Global variables are declared outside any functions and usually at the top of the program as shown below.
They can be used in the program inside any block of code.

The Output of Global Variable in C.


3. Formal Parameters

Formal Parameters are the parameters that are used inside the body of a function. Formal parameters are treated as local variables in that function and get a priority over the global variables.

The output of Formal Parameters in C:


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