Introduction to C Programming
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Questions and Answers

What are the three types of identifiers in C?

  • Reserved words
  • Standard identifiers
  • Programmer-created identifiers
  • All of the above (correct)

    • All uppercase letters in C are strictly reserved for constant naming.

    False

    What is a reserved word in C?

    A word that is predefined by the programming language for a special purpose.

    What function is commonly used to take input from the user in C?

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

    The function to format data and send it to the display device is called ______.

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

    C is a case-insensitive programming language.

    <p>False</p> Signup and view all the answers

    What type of whitespace does C ignore?

    <p>All of the above</p> Signup and view all the answers

    What are comments used for in C programming?

    <p>To clarify what a program does or what certain statements accomplish.</p> Signup and view all the answers

    Which of the following is a common programming error in C?

    <p>All of the above</p> Signup and view all the answers

    A function name in C must be followed by ______.

    <p>parentheses</p> Signup and view all the answers

    What does standard library in C consist of?

    <p>Both A and B</p> Signup and view all the answers

    Study Notes

    Introduction to C Programming

    • C is a broadly used programming language, providing a wide range of functions for various purposes.
    • The C standard library offers 15 header files, containing a comprehensive set of functions.
    • C has three types of identifiers:
      • Reserved words: predefined words used for specific purposes in the language.
      • Standard identifiers: predefined words in C, often function names from the standard library.
      • Programmer-created identifiers: names chosen by programmers for variables and functions, subject to C's naming rules.
    • C is a case-sensitive language, so TOTAL and total are distinct identifiers.

    Identifier Rules

    • Programmer-created identifiers can be any combination of letters, digits, and underscores (_).
    • First character must be a letter or underscore.
    • Identifiers cannot be reserved words.
    • Blank spaces are not allowed.
    • All uppercase letters are used to indicate a constant.
    • Function names should be followed by parentheses.
    • Descriptive identifiers should be used, like degToRadians(), rather than vague names like easy, duh, or justDoIt.

    The main() Function

    • The main() function is essential to a C program, often referred to as the driver function.
    • The program execution begins at the start of the main() function.
    • The end of the main() function marks the end of the program.

    Simple Input/Output Operations

    • Input refers to any data entered into a program.
    • The scanf() function reads formatted input from the standard input, such as keyboards.
    • scanf() has the format scanf("%d", &variable);.
    • The printf() function is used to format and send data to the standard system display, such as a monitor.
    • Passing data to a function is known as passing arguments.
    • Messages within printf() are called strings, which are enclosed within double quotes, like "Hello, world!".
    • The printf() function has the format printf("Hello there world!");.
    • Comments are denoted by / and * symbols and do not affect program execution.

    Programming Style: Indentation

    • C ignores white space, except for strings, reserved words, and function names.
      • This refers to any combination of spaces, tabs, or new lines.
    • Indentation is crucial for readability and organization.
      • Function names are placed on their own lines, with opening and closing braces aligned on their own lines as well.
      • Program statements are indented two spaces within a function.
      • Consistent indentation makes code easier to read and understand.

    Programming Style: Comments

    • Comments are important for explaining a program's functionality and clarification.
      • They do not impact program execution.
      • Comments can appear anywhere in a program.
      • Comments cannot be nested, so /* invalid */ is not valid.

    Common Programming Errors

    • Common errors include:
      • Omitting the parentheses after main.
      • Forgetting the opening and closing braces for functions.
      • Misspelling function names, such as print() instead of printf().
      • Neglecting to close strings passed to printf() with double quotes.
      • Omitting semicolons at the end of executable statements.
      • Missing \n to indicate a new line.

    Summary

    • A C program is composed of one or more functions.
    • A function is a C language representation of an algorithm.
    • The standard library provides a collection of functions.
      • Programs can utilize functions through the #include directive.

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    Related Documents

    Getting-Started-in-C-Programming.pdf

    Description

    Explore the fundamentals of C programming, including the types of identifiers and rules for creating programmer-defined names. Learn about the C standard library and the significance of naming conventions. Test your knowledge with this comprehensive quiz.

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