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Questions and Answers
What does C provide for programming functions?
What does C provide for programming functions?
A comprehensive set of functions stored in a standard library.
Which of the following are types of identifiers in C? (Select all that apply)
Which of the following are types of identifiers in C? (Select all that apply)
Reserved words in C can be used as identifiers.
Reserved words in C can be used as identifiers.
False
A ________ in C is a word that is predefined by the programming language for a special purpose.
A ________ in C is a word that is predefined by the programming language for a special purpose.
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What is the syntax for the scanf function?
What is the syntax for the scanf function?
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What is the purpose of the printf function?
What is the purpose of the printf function?
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C ignores all white space except for strings, function names, and reserved words.
C ignores all white space except for strings, function names, and reserved words.
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What is a common programming error related to functions in C?
What is a common programming error related to functions in C?
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Which of the following practices reflect good programming style in C? (Select all that apply)
Which of the following practices reflect good programming style in C? (Select all that apply)
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Study Notes
Introduction to C Programming
- C provides a comprehensive set of functions stored in the standard library, which includes 15 header files.
Identifiers in C
- Types of identifiers:
- Reserved words: Predefined words with special purposes, also called keywords.
- Standard identifiers: Predefined words in C, primarily names of functions in the standard library.
- Programmer-created identifiers: User-defined names for data and functions, following specific rules.
- Rules for programmer-created identifiers:
- Must start with a letter or underscore.
- Followed by letters, digits, or underscores; no blank spaces.
- Cannot be reserved words.
- Examples of invalid identifiers:
- Starting with a digit (e.g., 4ab7).
- Containing spaces (e.g., calculate total).
- Using reserved words (e.g., while).
- C is case-sensitive; TOTAL and total are different identifiers.
- Good example for function naming: degToRadians(); poor choices: easy, duh, justDoIt.
The main() Function
- Known as the driver function, it serves as the entry point for all C programs.
Simple Input/Output Operations
-
Input Operations:
- Inputs are data entered into a program.
-
scanf(): A commonly used function to read formatted input. - Syntax example:
scanf("%d", &variable);
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Output Operations:
-
printf(): Formats and sends output to the display device (monitor). - Strings are character sequences in double quotes.
- Syntax example:
printf("Hello there world!");
-
Programming Style
-
Indentation:
- C ignores white space; good practice includes placing function names and braces on separate lines, with proper indentation for statements.
-
Comments:
- Used to explain code functionality; no effect on execution.
- Symbols indicate end of comments, and nesting comments is not allowed.
Common Programming Errors
- Omitting parentheses after main.
- Incorrectly typing or omitting braces for function bodies.
- Misspelling function names (e.g., print() instead of printf()).
- Forgetting to close strings or omit semicolons.
- Forgetting to include
\nfor new lines in output.
Summary of C Programs
- A C program consists of one or more functions, where each function describes an algorithm.
- Many functions are available in the standard library for use.
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Description
This quiz covers the basics of C programming, including simple input/output operations and programming styles. It's based on 'A First Book of ANSI C' and focuses on providing foundational concepts and functions in C. Test your knowledge and understanding of C programming principles.
