Introduction to C Programming

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Questions and Answers

Which of the following is the correct sequence when learning the C programming language?

Alphabets, Constants, Functions, Programs

Functions, Programs, Constants, Reserved Words

Keywords, Functions, Instructions, Variable

Character Set, Keywords, Instructions, Functions (correct)

What does the character set in C programming include?

Alphabets, digits, and special symbols (correct)

Only identifiers and constants

Only alphabets and digits

Only special symbols and keywords

Which of the following terms is NOT part of the vocabulary formed in the C language?

Sentences (correct)

Constants

Functions

Variables

What is the primary first step in learning to write programs in C?

Learning keywords and reserved words Signup and view all the answers

What is represented by the special symbols in the C character set?

Operators and syntax rules Signup and view all the answers

What role do identifiers play in the syntax of the C programming language?

They are used to create variables, functions, and more Signup and view all the answers

What step follows after learning constants and variables in C?

Understanding syntax rules Signup and view all the answers

Which of the following is a correct example of a character in C?

@ Signup and view all the answers

What are the smallest individual units in a C program called?

C-Tokens Signup and view all the answers

How many keywords are predefined in the C programming language?

32 Signup and view all the answers

Which of the following is NOT a type of C-token?

Data types Signup and view all the answers

What cannot be used as variable names in C programming?

Keywords Signup and view all the answers

Which of the following is an example of a special symbol in C?

< Signup and view all the answers

Which tokens in C are user-defined names that represent objects or functions?

Identifiers Signup and view all the answers

What type of C-token represents fixed values?

Constants Signup and view all the answers

Which of these is a string token in C programming?

"Hello World" Signup and view all the answers

Why can’t a keyword be used as a variable name?

It attempts to assign a new meaning to the keyword. Signup and view all the answers

Which of the following is NOT a type of constant supported in C?

Boolean Constants Signup and view all the answers

Which of the following represents a valid identifier in C?

value_2 Signup and view all the answers

What character is commonly used to begin an identifier in C?

_ (underscore) Signup and view all the answers

How are integer constants represented in C?

In binary, octal, decimal, and hexadecimal formats. Signup and view all the answers

What defines a binary number?

It comprises only the digits 0 and 1. Signup and view all the answers

What character can be used within identifiers in C?

_ (underscore) Signup and view all the answers

What is the representation of the binary number 110100?

26 in decimal. Signup and view all the answers

Which of the following is a valid hexadecimal integer?

0X2F Signup and view all the answers

What is the decimal equivalent of the hexadecimal number 2DB7?

11703 Signup and view all the answers

Which of the following represents a valid real constant?

-.5 Signup and view all the answers

What does the 'e' or 'E' denote in exponential notation?

Multiplication by 10 raised to an exponent Signup and view all the answers

Which of the following is not a valid single character constant?

'12' Signup and view all the answers

Which representation can be used for very large numbers?

Exponential notation Signup and view all the answers

Which of these numbers is a valid floating point constant?

9.8e-3 Signup and view all the answers

What is the correct form for representing the number 215.65 in exponential notation?

21565e-2 Signup and view all the answers

What keyword indicates that a variable's value cannot be modified by the program?

const Signup and view all the answers

Which qualifier is used to indicate that a variable may be changed by external sources?

volatile Signup and view all the answers

In the basic structure of a C program, what is the correct order of sections?

Documentation Section, Link Section, Global Declaration Section Signup and view all the answers

Which format code is used to print a string in C?

%s Signup and view all the answers

What does the documentation section in a C program typically contain?

Comment lines about the program Signup and view all the answers

What is the purpose of the main () function section in a C program?

To execute the program's main functionality Signup and view all the answers

Which format code would be appropriate to use for printing a long integer?

%ld Signup and view all the answers

If a variable must not be modified by the program but may be changed externally, what qualifiers should it have?

const and volatile Signup and view all the answers

Study Notes

Learning C Language

Learning C is analogous to learning the English language, starting with fundamental components.
The process involves understanding characters, combining them into vocabulary, creating instructions, and structuring functions or complete programs.

Character Set in C

The character set includes alphabets (A-Z, a-z), digits (0-9), and special symbols (e.g., !@#~`%^&*).
This set forms the vocabulary of C and includes constants, variables, and keywords.
ASCII table lists character values and descriptions for data representation.

C Tokens

C programs consist of tokens, the smallest units of the language:
- Keywords: predefined words recognized by the C compiler.
- Identifiers: user-defined names for variables, functions, and arrays.
- Constants: fixed values that do not change during execution.
- Strings: sequences of characters.
- Special Symbols: additional syntax elements.

Keywords

There are 32 reserved keywords in C that cannot be used as variable names, such as int, float, char, and return.

Identifiers

Identifiers are the names assigned by users to elements in the C program, must begin with a letter or underscore, and may include numerical digits.

Constants

Constants represent fixed values in a program, categorized into:
- Numeric (e.g., integers, real numbers)
- Character (single characters)
- Logical (true/false values)

Types of Numeric Constants

Integer Constants: categorized into binary, decimal, octal, and hexadecimal.
Real Constants: include fractional parts and can be expressed in exponential notation (e.g., 1.5e3).

Single Character Constants

Enclosed in single quotes (e.g., 'x', '5'). Different from numeric values.

Variable Qualifiers

const: indicates a variable’s value should not be altered in the program.
volatile: signals that a variable’s value may change due to external factors.

Format Codes

Used for formatted output:
- %c for characters
- %d, %i for decimal integers
- %f, %g for floating point values
- %s for strings

Basic Structure of a C Program

A C program generally consists of:
- Documentation Section: comments about the program.
- Link Section: includes libraries.
- Definition Section: defines constants and macros.
- Global Declaration Section: declares global variables.
- Main Function Section: contains the main execution block, with declarations and executable code.
- Subprogram Section: contains additional functions.

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Description

This quiz covers the fundamental concepts of C programming, emphasizing the importance of learning the basics, such as alphabets, symbols, constants, and variables. Just as learning English begins with the alphabet, mastering C starts with understanding its foundational elements. Test your knowledge of these essential principles in this introductory quiz.

Introduction to C Programming

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Questions and Answers

Which of the following is the correct sequence when learning the C programming language?

What does the character set in C programming include?

Which of the following terms is NOT part of the vocabulary formed in the C language?

What is the primary first step in learning to write programs in C?

What is represented by the special symbols in the C character set?

What role do identifiers play in the syntax of the C programming language?

What step follows after learning constants and variables in C?

Which of the following is a correct example of a character in C?

What are the smallest individual units in a C program called?

How many keywords are predefined in the C programming language?

Which of the following is NOT a type of C-token?

What cannot be used as variable names in C programming?

Which of the following is an example of a special symbol in C?

Which tokens in C are user-defined names that represent objects or functions?

What type of C-token represents fixed values?

Which of these is a string token in C programming?

Why can’t a keyword be used as a variable name?

Which of the following is NOT a type of constant supported in C?

Which of the following represents a valid identifier in C?

What character is commonly used to begin an identifier in C?

How are integer constants represented in C?

What defines a binary number?

What character can be used within identifiers in C?

What is the representation of the binary number 110100?

Which of the following is a valid hexadecimal integer?

What is the decimal equivalent of the hexadecimal number 2DB7?

Which of the following represents a valid real constant?

What does the 'e' or 'E' denote in exponential notation?

Which of the following is not a valid single character constant?

Which representation can be used for very large numbers?

Which of these numbers is a valid floating point constant?

What is the correct form for representing the number 215.65 in exponential notation?

What keyword indicates that a variable's value cannot be modified by the program?

Which qualifier is used to indicate that a variable may be changed by external sources?

In the basic structure of a C program, what is the correct order of sections?

Which format code is used to print a string in C?

What does the documentation section in a C program typically contain?

What is the purpose of the main () function section in a C program?

Which format code would be appropriate to use for printing a long integer?

If a variable must not be modified by the program but may be changed externally, what qualifiers should it have?

Study Notes

Learning C Language

Character Set in C

C Tokens

Keywords

Identifiers

Constants

Types of Numeric Constants

Single Character Constants

Variable Qualifiers

Format Codes

Basic Structure of a C Program

Studying That Suits You

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