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Questions and Answers
Which of the following is a design issue for names in programming languages?
Which of the following is a design issue for names in programming languages?
- Case sensitivity
- Variable length
- Special characters at the beginning of variable names
- All of the above (correct)
Which programming language imposes a limit on the length of external names?
Which programming language imposes a limit on the length of external names?
- PHP
- Java
- C#
- C99 (correct)
In which programming language are all variable names required to begin with special characters specifying the variable’s type?
In which programming language are all variable names required to begin with special characters specifying the variable’s type?
- Perl (correct)
- Ruby
- C++
- PHP
In which type of languages are predefined names mixed case, leading to potential readability issues?
In which type of languages are predefined names mixed case, leading to potential readability issues?
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What attributes characterize variables in imperative languages according to the text?
What attributes characterize variables in imperative languages according to the text?
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Study Notes
Programming Language Design Issues
- Design issues for names include considerations such as readability, scope, and naming conventions which can impact programming efficiency and maintainability.
Limit on Length of Names
- COBOL imposes a specific limit on the length of external names, influencing how developers structure their identifiers.
Requirement of Special Characters
- In PL/1, all variable names must start with special characters that indicate the variable’s type, enforcing a strict naming convention that aids in type identification.
Mixed Case Predefined Names
- In some programming languages, such as C and C++, predefined names use mixed case which may lead to inconsistency and hinder readability for programmers.
Variables in Imperative Languages
- Variables in imperative languages are characterized by attributes such as scope, lifetime, and type, each playing a crucial role in how variables operate within the code context.
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