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Fundamentals of Programming Language (FPL): Unit 1 Revision Notes

Fundamentals of Programming Language (FPL): Unit 1 Revision

This lecture covers the foundational concepts of C programming from Unit 1 of Fundamentals of Programming Language (FPL). It details the history and significance of C, flowchart design symbols, keywords, identifiers, tokens, data types, symbolic constants, storage qualifiers (const and volatile), and algorithm writing.

Computer
English · 10 topics
Checked against the video on 21 Oct 2026

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Fundamentals of Programming Language (FPL): Unit 1 Revision

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In short

This lecture covers the foundational concepts of C programming from Unit 1 of Fundamentals of Programming Language (FPL). It details the history and significance of C, flowchart design symbols, keywords, identifiers, tokens, data types, symbolic constants, storage qualifiers (const and volatile), and algorithm writing.

Introduction and History of C Programming

The lecture provides a one-shot revision of Unit 1 of Fundamentals of Programming Language (FPL) titled "Introduction to Program Planning & C Programming".
Must knowThe C programming language was developed by Dennis Ritchie at Bell Labs in the USA in 1972.
Dennis Ritchie created C while working on developing the UNIX operating system.
The C language was standardized in 1978 in the book "The C Programming Language" by Brian Kernighan and Dennis Ritchie (K&R).
In 1989, C was standardized by the American National Standards Institute as ANSI C (C89), which was later followed by updates like C99, C11, C17, and C23.

Importance and Features of C Programming

C serves as a foundational language that shaped many modern languages such as C++, Java, Python, and JavaScript.
Must knowC is extensively used in system programming, including operating systems, compilers, device drivers, and embedded systems.
C delivers high performance by providing direct memory access and low-level control.
Programs written in C are portable and flexible, running across different platforms with minimal changes.
C teaches basic programming concepts such as variables, loops, functions, and pointers, making it useful for careers and technical interviews.

Program Design Tools and Flowchart Symbols

Flowcharts provide a graphical representation of the logic of a program or algorithm using standard symbols connected by arrows.
Must knowThe oval (terminator) symbol indicates the beginning or end of a program (Start/Stop).
A parallelogram is used to represent input and output operations, such as reading data or displaying results.
A rectangle represents a process, calculation, or assignment step in a program.
A diamond shape represents a decision or condition with branches (such as Yes/No or True/False).
A flow line (arrow) shows the direction of process flow, while a circle acts as an on-page connector.

Keywords and Identifiers in C

Keywords are reserved words that have a special predefined meaning in C and cannot be used as variable or function names.
Examples of keywords include int, float, char, if, else, for, while, return, and void.
Must knowIdentifiers are names given to program elements such as variables, functions, arrays, and structures, and are created by the programmer.
Identifiers can contain letters, digits, and underscores, but they must not start with a digit.
Identifiers cannot contain spaces, special symbols (like @, #, -), or be keywords.
C is case-sensitive, meaning that uppercase and lowercase identifiers (such as age and AGE) are treated as completely different.

Tokens in C Programming

A token is the smallest individual unit of a C program that carries a meaningful purpose.
C tokens are classified into six categories: keywords, identifiers, constants, string literals, operators, and special symbols (punctuators).
Constants are fixed values that do not change, such as 10 and 3.14.
String literals consist of text enclosed within double quotes, such as "Hello".
Operators perform mathematical or logical operations (such as +, -, *, =).
Special symbols or punctuators (like semicolons, curly braces, and parentheses) provide structure to the program.

Token Type	Meaning	Example
Keywords	Reserved words	int, if, while
Identifiers	Names given by programmer	age, sum
Constants	Fixed values	10, 3.14
String literals	Text inside double quotes	"Hello"
Operators	Perform operations	+, -, *, =
Special symbols	Give structure to program	;, {}, ()

Data Types in C

Data types in C are broadly categorized into primitive (basic) types and derived types.
Must knowPrimitive basic types include int (for integers), float (for decimals), char (for characters), and double (floating-point).
Other primitive types include void (signifying empty or no value) and boolean (representing true or false).
Derived data types are constructed using basic types and include arrays, pointers, structures, and unions.
An array stores multiple values of the same type sequentially with index-based access.

Defining Symbolic Constants

A symbolic constant is an identifier that represents a constant value throughout the program.
Must knowSymbolic constants are defined using the preprocessor directive #define.
The syntax for defining a symbolic constant is: #define NAME VALUE.
Examples of symbolic constants include: #define PI 3.14159, #define MAX 100, and #define MSG "Hello, World!".
During preprocessing, every occurrence of the symbolic constant name in the source code is replaced by its assigned value.
Using symbolic constants improves code readability and makes programs easier to maintain.

Declaring Variables as const and volatile

Variables can be modified using type qualifiers such as const and volatile.
Must knowThe const keyword tells the compiler that the variable's value is fixed and cannot be modified after initialization.
Attempting to modify a const variable generates a compile-time error.
The volatile qualifier tells the compiler that a variable's value can change unexpectedly at any time due to external factors (such as hardware, interrupts, or other threads).
Declaring a variable as volatile prevents the compiler from optimizing operations on that variable.

Algorithm Definition and Design

An algorithm is a step-by-step procedure used to solve a problem or perform a specific task.
Formulating an algorithm before coding ensures lower risk of errors and structured implementation.
To add two numbers, the algorithm steps are: Step 1: Start; Step 2: Input/Read two numbers A and B; Step 3: Process SUM = A + B; Step 4: Display/Output SUM; Step 5: Stop.
An example execution takes inputs A = 10 and B = 20, calculates SUM = 10 + 20, and outputs 30.

Constants in C

A constant is a fixed value that does not change during the execution of a program.
Integer constants are whole numbers without decimal points (positive, negative, or zero), such as 10, -25, and 0.
Floating-point constants are decimal numbers that can be written in decimal or exponential form, such as 3.14 and -0.5.
Character constants represent a single character enclosed in single quotes, such as 'A', '7', or '$'.

Key terms

Dennis Ritchie: The computer scientist who developed the C programming language at Bell Labs in 1972
Token: The smallest individual unit of a C program that has a meaningful purpose
Keyword: A reserved word in C that has a fixed, predefined meaning and cannot be redefined
Identifier: A user-defined name given to program elements like variables, functions, and arrays
Flowchart: A graphical diagram representing the logical steps of an algorithm using standard shapes
Symbolic Constant: A name defined via #define that represents a constant value substituted during preprocessing
const: A type qualifier that makes a variable's value read-only after initialization
volatile: A type qualifier informing the compiler that a variable's value may change at any time externally
Algorithm: A finite step-by-step procedure for solving a computational problem

Formulas

#define NAME VALUE: Syntax to define a symbolic constant using preprocessor directive
const data_type variable_name = value;: Syntax to declare a read-only constant variable
volatile data_type variable_name = value;: Syntax to declare a volatile variable whose value can change externally

Quick revision

Read these the night before the exam.

C was created by Dennis Ritchie at Bell Labs in 1972 during the development of the UNIX OS.
An oval shape in a flowchart represents the terminator (Start or Stop).
A parallelogram represents input and output operations in a flowchart.
A diamond shape is used in flowcharts to represent decision-making conditions.
Identifiers can contain letters, digits, and underscores, but cannot start with a digit.
C is case-sensitive, so uppercase and lowercase variable names are treated differently.
The six C tokens are keywords, identifiers, constants, string literals, operators, and special symbols.
Symbolic constants are created using the preprocessor directive #define without a semicolon.
The const keyword prevents any modification to the initialized variable.
Character constants in C are always enclosed within single quotes.

These notes are made by AI from the video. Use the timestamps to check any important fact against the video before you rely on it.

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