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Chapter 4: Problem 49

True or False The scope of a variable is limited to the block in which it is defined.

Short Answer

Expert verified
Answer: True

Step by step solution

01

Understanding the concept of variable scope

Variable scope defines the region within a program where a variable is visible and accessible. In most programming languages, the scope of a variable depends on where it is declared and the type of the block it is in.
02

Examining the statement

The exercise statement claims that the scope of a variable is limited to the block in which it is defined. It's important to note that the statement does not specify which programming language is being referred to, so we will consider this as a general statement for most programming languages.
03

Explaining variable scope through examples

Let's consider two examples in different programming languages: Python example: ``` def example_function(): x = 10 # x is local to example_function print(x) # This would raise an error, because x is not defined in this scope ``` C++ example: ``` #include int main() { { int x = 10; // x is local to this block } std::cout << x; // This would raise an error, because x is not defined in this scope return 0; } ``` In both examples, the variable x is declared within a block (a function in Python and a pair of curly braces in C++). The scope of the variable x is limited to that particular block, so trying to access it outside of that block will lead to an error.
04

Concluding the answer

Given the explanation and the examples from different programming languages, the statement "The scope of a variable is limited to the block in which it is defined" is generally true for most programming languages. However, it's important to note that variable scoping rules can vary between different programming languages, and there may be exceptions or extensions to this rule in some cases.

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