C Programming Basics
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Questions and Answers

What is the smallest individual unit in a C program that is meaningful to the compiler?

  • Keywords
  • Tokens (correct)
  • Constants
  • Identifiers
  • What are keywords in C?

  • Reserved words with predefined meanings (correct)
  • Variables with special meanings
  • User-defined names
  • Functions with specific purposes
  • What is the purpose of the printf() function in C?

  • Reading formatted input
  • Storing data into variables
  • Printing formatted output (correct)
  • Clearing the screen
  • What is the purpose of the scanf() function in C?

    <p>Reading formatted input</p> Signup and view all the answers

    What is the purpose of the clrscr() function in C?

    <p>Clearing the screen</p> Signup and view all the answers

    What is the purpose of the getch() function in C?

    <p>Getting a character input without echoing it to the screen</p> Signup and view all the answers

    What is the common use of the scanf() function?

    <p>Inputting values from the user during runtime</p> Signup and view all the answers

    Why are clrscr() and getch() functions used in console-based programs?

    <p>For better screen management and user interaction</p> Signup and view all the answers

    What is a one-dimensional array in C?

    <p>A linear array where elements are stored in a single row or column</p> Signup and view all the answers

    What is the main difference between one-dimensional and multi-dimensional arrays?

    <p>The number of indices used to access elements</p> Signup and view all the answers

    What are arithmetic operators used for in C?

    <p>To perform mathematical operations</p> Signup and view all the answers

    What is the function of relational operators in C?

    <p>To compare the values of two operands</p> Signup and view all the answers

    What is an example of a relational operator in C?

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

    What is the function of the increment (++) operator in C?

    <p>To increment the value of a variable</p> Signup and view all the answers

    What is the purpose of variables in C programming?

    <p>To store data values.</p> Signup and view all the answers

    What determines the size and layout of a variable's memory?

    <p>Data type.</p> Signup and view all the answers

    Which data type is used to store whole numbers without decimal points?

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

    What is the typical size of a 'long long' integer in C?

    <p>8 bytes</p> Signup and view all the answers

    What is the purpose of pointers in C?

    <p>To store memory addresses.</p> Signup and view all the answers

    What is a structure in C?

    <p>A user-defined data type.</p> Signup and view all the answers

    What is an array in C programming?

    <p>A collection of elements of the same data type.</p> Signup and view all the answers

    How are elements in an array accessed?

    <p>Using an index.</p> Signup and view all the answers

    Study Notes

    C Programming Basics

    • Tokens are the smallest individual units in a program that are meaningful to the compiler.
    • Tokens can be identifiers, keywords, constants, strings, or symbols like operators and punctuation.

    Keywords

    • Keywords are reserved words that have predefined meanings and cannot be used for other purposes.
    • Examples of keywords in C include 'int', 'char', 'if', 'else', 'for', 'while', and 'return'.

    printf() Function

    • The printf() function is used to print formatted output to the standard output (usually the console).
    • It takes a format string followed by optional arguments, formats them according to the format string, and then prints the resulting string.

    scanf() Function

    • The scanf() function is used for reading formatted input from the standard input (usually the keyboard) and storing the data into variables.
    • It works similarly to printf(), but in reverse, reading formatted data from the user and assigning it to variables.

    clrscr() and getch() Functions

    • clrscr() is used to clear the screen, removing any previously printed output, making the screen blank.
    • getch() is used to get a character input from the user without echoing it to the screen.

    Variables and Data Types

    • Variables are used to store data values.
    • Each variable in C has a specific data type, which determines the size and layout of the variable's memory, as well as the range of values it can store.
    • There are several data types in C, including:
      • Integers (int, short, long, long long)
      • Floating-point numbers (float, double, long double)
      • Characters (char)
      • Arrays (one-dimensional and multi-dimensional)
      • Pointers (store memory addresses)
      • Structures (user-defined data types that can hold multiple variables of different types)

    Arrays

    • An array is a collection of elements of the same data type that are stored in contiguous memory locations.
    • Each element can be accessed using an index.
    • There are two main types of arrays in C:
      • One-dimensional array (linear array where elements are stored in a single row or column)
      • Multi-dimensional array (array with more than one dimension, such as two-dimensional arrays)

    Operators

    • Operators are symbols that represent computations or actions to be performed on operands.
    • There are several types of operators in C, including:
      • Arithmetic Operators (+, -, *, /, %, ++, --)
      • Relational Operators (==, !=, >, <, >=, <=)

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    Description

    This quiz covers the fundamental concepts of C programming, including tokens and keywords. Learn about the building blocks of C programs and how they are used by the compiler to understand and process code.

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