A variable declared within the block {} has the following scope:

Question

Accepted Answer

The correct option is (2):
In the context of programming languages such as C and C++, a variable declared inside an arbitrary block of code, delimited by curly braces ({}), is said to have **Local Scope** or, more specifically, **Block Scope**. The fundamental principle of this scope is that the variable is created when the program execution enters the block and is automatically destroyed when the execution exits the block. Consequently, the variable is only visible and accessible for use by statements *within* those two curly braces. This restrictive scope is crucial for memory efficiency and preventing unintended side effects or naming conflicts in other parts of the program.

The incorrect option is (1):
File Scope, often referred to as global scope in a single-file context, applies to variables that are declared outside of all functions and blocks in a source file. This gives them visibility from the point of declaration until the end of that specific file. This is a much wider scope than a variable declared inside a block, which is restricted to its immediate enclosing braces. Therefore, a variable declared only within a `{}` block does not possess file scope.

The incorrect option is (3):
Class Scope is a distinct concept used in Object-Oriented Programming (OOP) to define the visibility of member variables (data members) and member functions within a class. A variable with class scope is accessible throughout all member functions of that class, regardless of where those functions are defined. This scope is tied to the class's structure and the lifetime of an object, which is fundamentally different from the temporary and immediate block-level scope.

The incorrect option is (4):
Global Scope refers to variables that are declared outside of all functions and are typically visible across the entire program, even across multiple source files (often requiring the `extern` keyword). Variables with global scope exist for the entire duration of the program's execution. This is the broadest form of scope available and is incompatible with the temporary, highly restricted visibility provided by a variable defined inside a local `{}` block.