Overview of C Programming Language
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Questions and Answers

What is the purpose of comments in a program?

  • They execute actions within the program
  • They improve the readability of the program (correct)
  • They allow the program to run more efficiently
  • They replace the need for variable declarations

Which of the following statements about the main() function is true?

  • The main() function can only have local variables
  • The program execution starts with the main() function (correct)
  • The main() function should contain no parameters
  • The main() function cannot return any value

How are single line comments written in C?

  • Using // comment (correct)
  • Using # comment
  • Using /* comment */
  • Using -- comment

What is a correct example of a pre-processor directive in C?

<p>#include&lt;stdio.h&gt; (A)</p> Signup and view all the answers

What section of a C program consists of user-defined functions?

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

Which of the following statements about the C programming language is true?

<p>C is a procedure-oriented programming language. (D)</p> Signup and view all the answers

What is NOT a feature of the C programming language?

<p>Strictly interpreted language (D)</p> Signup and view all the answers

Which of the following is an example of a keyword in C?

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

Which of the following names is a valid identifier according to the naming rules?

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

What character is used to terminate every statement in C?

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

What is a requirement for variable names in C programming?

<p>Cannot start with a digit (D)</p> Signup and view all the answers

Which of the following options is NOT considered a token in C programming?

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

Which of the following is NOT an example of a constant in C?

<p>int max = 100 (B)</p> Signup and view all the answers

What type of characters are included in the character set of C?

<p>Lower case alphabets, upper case alphabets, digits and other characters (C)</p> Signup and view all the answers

What type of operator operates on two operands?

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

Which of the following symbols is used for pre-processor directives in C?

<h1>(A)</h1> Signup and view all the answers

In the general structure of a C program, what does '#include <stdio.h>' signify?

<p>Link section (C)</p> Signup and view all the answers

Which of the following describes identifiers in C programming?

<p>They refer to names given by the programmer to elements. (B)</p> Signup and view all the answers

Which of the following statements about identifiers in C is incorrect?

<p>Identifiers can begin with any character (A)</p> Signup and view all the answers

What can you expect the compiler to do if you try to change the value of a constant defined with #define?

<p>Compiler will throw an error (B)</p> Signup and view all the answers

Which part of the C program structure indicates the beginning of the program execution?

<p>int main() (C)</p> Signup and view all the answers

Flashcards

Comments in C

Non-executable statements ignored by the compiler; used to improve code readability.

Single-line comment

A comment that spans one line in C, starting with two forward slashes (//).

#include directives

Used to link header files containing pre-defined functions and data, such as input/output operations.

Global Section

Part of a C program where global variables, accessible throughout the program, are declared.

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main() function

The entry point of a C program; execution begins here.

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C Programming Language

A high-level, procedure-oriented language developed in 1972.

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Features of C

Robust, middle-level, portable, structured, and extensible language.

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C Character Set

Includes letters (a-z, A-Z), numbers (0-9), special characters, and spaces.

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C Tokens

Smallest indivisible units in a C program: keywords, operators, identifiers, etc.

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Keywords

Reserved words in C with specific meanings (e.g., int, while, if).

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Special Symbols

Symbols with specific purposes (e.g., semicolons, commas).

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Identifiers

Names given to variables, functions, and other program elements.

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C Program Structure

A program with various parts (like functions and statements) that the computer follows.

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Identifier Naming Rules

Rules for naming variables, constants, and functions in C. Identifiers must contain alphabets, digits, and underscores, but cannot start with digits. Case matters (e.g., myVar and myvar are different).

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Variable

A named storage location in a program that holds data values that might change during program execution.

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Constant

A named storage location that holds a fixed value throughout the program run.

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Symbolic Constant

A constant defined using the #define preprocessor directive in C, which substitutes the constant name with its value.

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Unary Operator

An operator that operates on a single operand.

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Binary Operator

An operator that requires two operands.

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C Program Structure (General)

A C program has distinct sections: comments, preprocessor directives (#include, #define), global declarations, the main function, user-defined functions. Each section serves a specific purpose.

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Documentation Section

The part of a C program where comments explain the program's purpose, logic, and intended behavior.

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Study Notes

Overview of C Programming Language

  • High-level language
  • Procedure-oriented language
  • Developed in 1972 by Dennis Ritchie at Bell Labs
  • Robust programming language, rich set of operators, and built-in functions
  • Middle-level language, suitable for system and application programs
  • Portable code, runs on different machines
  • Structured code, broken down into parts (functions)
  • Extensible, allows for adding subprograms as needed

Character Set

  • Lowercase letters (a-z)
  • Uppercase letters (A-Z)
  • Digits (0-9)
  • Special characters (+ - * & $ ! @ # % { } [ ] : ; , ! etc.)
  • White spaces (space, newline, tab)

C Tokens

  • Smallest unit in a C program
  • Classified into Keywords, Special Symbols, Identifiers, Variables, Constants, and Operators

Keywords

  • Reserved words with predefined meaning
  • 32 keywords in C

Special Symbols

  • Symbols with special meanings (e.g., ;, =, {, }, etc.)

Identifiers

  • Names given by the programmer to variables, constants, functions, etc.
  • Can contain letters, digits, and underscore (_)
  • Cannot start with a digit
  • Case-sensitive (e.g., myVariable and myvariable are different)
  • Keywords cannot be used as identifiers

Variables

  • Quantities that change during program execution
  • Storage areas for manipulation
  • Cannot start with a digit
  • Case-sensitive

Constants

  • Quantities that do not change
  • Can be defined using the #define preprocessor directive (symbolic constants)

Operators

  • Symbols used to perform operations
  • Classified by the number of operands they operate upon (e.g., unary, binary, ternary)

General Structure of a C Program

  • Documentation section
  • Link section (includes headers)
  • Definition section (preprocessor directives, constants)
  • Global section (global variables)
  • Main function section
  • Subroutine section (user-defined functions)
  • Comments are used to explain the code (single-line // and multi-line /* */)

Basic Structure of a C Program

  • Includes header files
  • int main() function
  • Curly braces {} enclose program statements
  • return 0; statement indicates successful program execution.

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Programming in C - Unit 1 PDF

Description

This quiz covers the fundamental concepts of the C programming language, including its history, character set, and types of tokens. It also delves into the importance of keywords, special symbols, and identifiers used in C programming. This is essential for understanding how to write and structure C code effectively.

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