C Language Keywords and Identifiers Quiz

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Questions and Answers

Which of the following is a characteristic of C language keywords?

  • They have fixed meanings and cannot be changed (correct)
  • They are case-sensitive
  • They can be user-defined
  • They can be used as variable names or constants

What is the main difference between keywords and identifiers in C language?

  • Keywords have fixed meanings, while identifiers are user-defined names (correct)
  • Keywords can be changed, while identifiers are case-sensitive
  • Identifiers are limited to 32 words, while keywords can be any length
  • Identifiers are reserved words, while keywords are user-defined

Which of the following is a valid C language keyword?

  • total
  • calculate
  • index
  • switch (correct)

Which of the following is a valid identifier in C language?

<p>total_sum (D)</p> Signup and view all the answers

What is the main characteristic of identifiers in C language?

<p>They can be user-defined names for variables, functions, and arrays (A)</p> Signup and view all the answers

Which of the following is a valid identifier in C language?

<p>sum_1 (B)</p> Signup and view all the answers

What is the purpose of reserved words (keywords) in C language?

<p>Reserved words have fixed meanings and cannot be used as variable names (B)</p> Signup and view all the answers

Which of the following is a characteristic of identifiers in C language?

<p>Identifiers can consist of both lower case and upper case letters (A)</p> Signup and view all the answers

How many reserved words (keywords) are there in the C language?

<p>32 (A)</p> Signup and view all the answers

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Study Notes

C Language Keywords

  • Keywords are predefined words in C language that have a specific meaning and purpose.
  • They are always written in lowercase letters and are reserved, meaning they cannot be used as variable names.

Keywords vs Identifiers

  • The main difference between keywords and identifiers is that keywords are predefined and have a specific meaning, while identifiers are user-defined names given to variables, functions, and labels.
  • Keywords are used to perform specific operations or functions, whereas identifiers are used to identify variables, functions, and labels.

Valid Keywords and Identifiers

  • int is a valid C language keyword.
  • myVariable is a valid identifier in C language.

Characteristics of Identifiers

  • Identifiers can contain letters, digits, and underscores, but must start with a letter or underscore.
  • Identifiers are case-sensitive, meaning myVariable and MyVariable are treated as different names.

Purpose of Reserved Words (Keywords)

  • The purpose of reserved words (keywords) is to define the structure and syntax of the C language program.
  • They are used to declare variables, define functions, and specify control structures, among other things.

Number of Reserved Words (Keywords)

  • There are 32 reserved words (keywords) in the C language.

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