C Notes

Hub Applications of C Programming Language Features of C Programming Language History of C Programming Language What is C Language?Why Learn C Programming in 2024?First C Program - Hello World in C with Explanation GCC Compiler - Complete Guide to GNU C Compiler Install C Compiler on Linux - GCC Setup Guide for All Distros Install C Compiler on macOS - Xcode Command Line Tools and Homebrew GCC Install C Compiler on Windows - MinGW, MSYS2, and WSL Guide Setup VS Code for C Programming - Complete Configuration Guide C Syntax Rules — Complete Guide Comments in C Programming Constants in C Programming Data Types in C Identifiers in C Programming Keywords in C Programming Structure of a C Program Variables in C Programming Arithmetic Operators in C Programming Assignment Operators in C Programming Bitwise Operators in C Programming Increment and Decrement Operators in C Logical Operators in C Programming Relational Operators in C Programming Ternary Operator in C Programming Break Statement in C Programming Continue Statement in C Programming Do-While Loop in C Programming For Loop in C Programming Goto Statement in C Programming if-else Statement in C Programming if Statement in C Programming Nested if Statements in C Programming Switch Statement in C Programming While Loop in C Programming Function Arguments in C - Pass by Value vs Pass by Reference Function Call in C Programming Function Declaration (Prototype) in C Function Definition in C Programming Introduction to Functions in C Programming Recursion in C Programming Return Statement in C Programming Storage Classes in C Programming Array Operations in C - Searching, Sorting, Insert and Delete Array Programs in C - Reverse, Rotate, Duplicates, Merge Introduction to Arrays in C Programming Multidimensional Arrays in C Programming One Dimensional Arrays in C Programming Passing Arrays to Functions in C Two Dimensional Arrays in C Programming String Comparison in C - strcmp, strncmp, Case-Insensitive String Functions in C - strlen, strcpy, strcat, strcmp C String Handling Library - Complete string.h Reference String Manipulation in C - Reverse, Uppercase, Palindrome String Programs in C - Anagram, Word Count, Vowels, Frequency Strings in C Programming - Complete Introduction Double Pointers in C - Pointer to Pointer Pointer Arithmetic in C Programming Pointer Declaration and Initialization in C Pointer Programs in C - Swap, String Reversal, Dynamic Allocation Pointers and Arrays in C - The Relationship Explained Pointers and Functions in C - Pass by Reference Introduction to Pointers in C Programming Void Pointers in C - Generic Pointers Guide calloc() in C – Contiguous Memory Allocation Dynamic Arrays in C – Runtime-Sized Arrays free() in C – Releasing Dynamic Memory malloc() in C – Dynamic Memory Allocation Memory Management Best Practices in C realloc() in C – Resizing Dynamic Memory Binary Files in C – fread and fwrite File Handling in C – Introduction File Handling Projects in C – Student Records & Phone Book File Modes in C – Complete Guide fopen() and fclose() in C – Opening and Closing Files Reading Files in C – fgetc, fgets, fscanf, fread Writing Files in C – fputc, fputs, fprintf, fwrite Conditional Compilation in C – #ifdef, #ifndef, #if #define Macros in C – Constants and Macro Functions Header Files in C – Creating Custom Headers #include Directive in C – File Inclusion Macro Functions in C – Parameterized Macros C Preprocessor – Overview and Directives Graphs in C – Adjacency Matrix, Adjacency List, BFS, and DFS Hash Tables in C – Implementation, Collision Handling, and Chaining Linked List in C – Singly, Doubly, and Circular with Implementation Queue in C – Linear, Circular, and Priority Queue Implementation Stack in C – Array and Linked List Implementation with Applications Trees in C – Binary Search Tree Implementation with Traversals C Programming Best Practices – Coding Standards, Safety, and Performance Bit Fields in C – Definition, Use Cases, and Protocol Headers C Standard Library Overview – All Headers and Common Functions Command Line Arguments in C – argc and argv Explained Debugging Techniques in C – GDB, Valgrind, and Sanitizers Function Pointers in C – Complete Guide with Examples Memory Layout of a C Program – Text, Data, BSS, Heap, Stack Bank Management System in C – Complete Project with File Storage File Encryption Tool in C – XOR Cipher Implementation Library Management System in C – Complete Project with Source Code Mini Compiler in C – Lexer and Parser for Simple Expressions Snake Game in C – Console-Based Game with Source Code Student Management System in C – Complete Project with Source Code C Programming Cheatsheet – Complete Quick Reference Guide Top 50 C Programming Interview Questions with Answers (2025)Memory Management Interview Questions in C with Answers Output Prediction Questions in C – What Will This Program Print?Pointer Interview Questions in C – Tricky Problems with Answers Common C Programming Errors and Solutions – Debugging Guide Important C Programs – 50+ Frequently Asked Programs with Solutions Quick Revision Notes for C Programming – Complete C in 10 Minutes Recommended C Programming Books – From Beginner to Expert Format Specifiers in C - Complete Reference getchar() and putchar() in C Programming gets() and puts() in C Programming C Input Output Programs and Examples printf() Function in C Programming scanf() Function in C Programming Arrays of Structures in C – Managing Collections Enums in C – Enumerated Data Types Nested Structures in C – Struct Within Struct Pointers to Structures in C – Arrow Operator Structures in C – User-Defined Data Types typedef in C – Creating Type Aliases Unions in C – Shared Memory Data Types

Comments in C Programming

Learn about comments in C — single-line comments, multi-line comments, best practices, nested comments, and when to use comments effectively in your code.

Have you ever gone back to code you wrote a few months ago and struggled to understand what it does? That's exactly the problem comments solve. Comments are human-readable notes added to source code that are completely ignored by the compiler. They exist purely for the benefit of programmers — whether that's your future self, your teammates, or anyone who reads your code.

Writing good comments is a skill that separates amateur programmers from professionals. Let's explore how comments work in C, the different types, and when you should (and shouldn't) use them.

Types of Comments in C

C supports two styles of comments:

Type	Syntax	Introduced In
Multi-line (block) comment	`/* ... */`	Original C (K&R, C89)
Single-line comment	`// ...`	C99 (borrowed from C++)

Single-Line Comments (`//`)

Single-line comments begin with // and continue until the end of that line. Everything after // on the same line is treated as a comment.

c example

#include <stdio.h>

int main() {
    int age = 25;        // stores the user's age
    float gpa = 3.8;    // grade point average

    // Print student information
    printf("Age: %d\n", age);
    printf("GPA: %.1f\n", gpa);

    return 0;  // indicate successful execution
}

Output

Age: 25
GPA: 3.8

When to Use Single-Line Comments

Brief explanations beside a line of code
Temporarily disabling a single line during debugging
Short notes about logic or decisions

c example

int maxRetries = 3;  // server timeout policy requires max 3 retries

// TODO: Add input validation here
// FIXME: This calculation overflows for large inputs

Multi-Line Comments (`/* ... */`)

Multi-line comments start with /* and end with */. Everything between these markers is ignored, regardless of how many lines it spans.

c example

#include <stdio.h>

/*
 * Program: Temperature Converter
 * Author: John Smith
 * Date: 2024-03-15
 * Description: Converts temperature from Celsius to Fahrenheit
 */

int main() {
    float celsius, fahrenheit;

    /* Get temperature input from user */
    printf("Enter temperature in Celsius: ");
    scanf("%f", &celsius);

    /*
     * Conversion formula:
     * F = (C × 9/5) + 32
     */
    fahrenheit = (celsius * 9.0 / 5.0) + 32.0;

    printf("%.2f°C = %.2f°F\n", celsius, fahrenheit);

    return 0;
}

Output

Enter temperature in Celsius: 100
100.00°C = 212.00°F

When to Use Multi-Line Comments

File headers (author, date, description)
Function documentation explaining parameters and return values
Disabling multiple lines of code during debugging
Complex algorithm explanations

Commenting Out Code (for Debugging)

One common use of comments is temporarily disabling code while debugging. Both comment styles work for this purpose.

c example

#include <stdio.h>

int main() {
    int x = 10, y = 20;

    // Temporarily disabled for testing
    // x = getUserInput();
    // y = getUserInput();

    /*
    printf("Debug info:\n");
    printf("x address: %p\n", &x);
    printf("y address: %p\n", &y);
    */

    printf("Sum: %d\n", x + y);
    return 0;
}

Output

Sum: 30

Pro tip: Version control (like Git) is a better alternative to commenting out code. Commented-out code clutters the file and often stays forever.

Nested Comments in C

A very important thing to know: C does not support nested multi-line comments. The first */ encountered will end the comment, regardless of any opening /* inside.

c example

/* This is a comment
   /* This nested comment BREAKS things */
   This line causes a compilation error! */

Here's what the compiler sees:

Example

/* This is a comment /* This nested comment BREAKS things */ ← comment ENDS here This line causes a compilation error! */ ← ERROR: unexpected code

Workaround for Nested Comments

If you need to comment out a block that already contains /* */ comments, use // for the outer layer or #if 0:

c example

// Method 1: Use single-line comments
// /* Original comment */
// int x = 10;
// int y = 20;

// Method 2: Use preprocessor directive (preferred)
#if 0
/* Original comment */
int x = 10;
int y = 20;
#endif

The #if 0 ... #endif approach is widely used because:

It handles nested comments correctly
It supports any content between the directives
It clearly signals "this code is disabled"

Comment Styles and Formatting

File Header Comment

c example

/************************************************************
 * File: calculator.c
 * Author: Jane Doe
 * Date: 2024-06-10
 * Description: Basic arithmetic calculator with error handling
 * Version: 2.1
 ************************************************************/

Function Documentation Comment

c example

/**
 * Calculates the factorial of a non-negative integer.
 *
 * @param n  The non-negative integer (must be <= 20 to avoid overflow)
 * @return   The factorial of n, or -1 if n is negative
 */
long factorial(int n) {
    if (n < 0) return -1;
    if (n == 0) return 1;
    return n * factorial(n - 1);
}

Inline Comments

Example

int binarySearch(int arr[], int size, int target) { int low = 0; int high = size - 1; while (low <= high) { int mid = low + (high - low) / 2; // avoids integer overflow if (arr[mid] == target) return mid; // found — return index else if (arr[mid] < target) low = mid + 1; // target is in right half else high = mid - 1; // target is in left half } return -1; // not found }

Section Separators

c example

/* ===================== */
/*   HELPER FUNCTIONS    */
/* ===================== */

void helperOne() { /* ... */ }
void helperTwo() { /* ... */ }

/* ===================== */
/*   MAIN LOGIC          */
/* ===================== */

int main() { /* ... */ }

Best Practices for Writing Comments

DO ✓

Explain WHY, not WHAT — the code shows what; comments should explain reasoning.

c example

// ✓ GOOD: explains why
int timeout = 30;  // 30 seconds per network team's SLA requirement

// ✗ BAD: just repeats the code
int timeout = 30;  // set timeout to 30

Keep comments updated — stale comments that don't match the code are worse than no comments.

Comment complex logic — algorithms, formulas, and non-obvious decisions deserve explanation.

c example

// ✓ GOOD: explains non-obvious formula
// Using Bresenham's algorithm for efficient integer-only line drawing
int d = 2 * dy - dx;

Use TODO/FIXME markers for known issues or planned improvements.

c example

// TODO: Replace with hash table for O(1) lookup
// FIXME: This fails when input array is empty
// HACK: Temporary workaround until API v2 is released

Document function interfaces — parameters, return values, side effects.

DON'T ✗

Don't state the obvious — trust readers to understand basic C.

Example

// ✗ BAD: painfully obvious i++; // increment i by 1

Don't comment every single line — over-commenting clutters code.

Don't leave commented-out code permanently — use version control instead.

Don't write novels — be concise and clear.

Practical Example: Well-Commented Program

Example

#include <stdio.h> #include <math.h> /** * Determines whether a number is prime. * * Uses trial division up to sqrt(n) for efficiency. * Time complexity: O(√n) * * @param n The number to check (must be > 0) * @return 1 if prime, 0 otherwise */ int isPrime(int n) { // Edge cases: numbers less than 2 are not prime if (n < 2) return 0; // 2 is the only even prime number if (n == 2) return 1; // Eliminate all other even numbers if (n % 2 == 0) return 0; // Check odd factors up to sqrt(n) // If n has a factor > sqrt(n), it must also have one < sqrt(n) int limit = (int)sqrt((double)n); for (int i = 3; i <= limit; i += 2) { if (n % i == 0) return 0; } return 1; } int main() { int count = 0; int target = 10; // find first 10 primes printf("First %d prime numbers:\n", target); // Start from 2 (smallest prime) and check each number for (int num = 2; count < target; num++) { if (isPrime(num)) { printf("%d ", num); count++; } } printf("\n"); return 0; }

Output

First 10 prime numbers:
2 3 5 7 11 13 17 19 23 29

How the Compiler Handles Comments

During the preprocessing phase (before actual compilation), all comments are replaced with a single space. This means comments have zero impact on:

Program size (binary file)
Execution speed
Memory usage

Example

/* Before preprocessing */ int/*comment*/x = 5; /* After preprocessing */ int x = 5;

This also means you cannot use comments to create tokens:

c example

// This does NOT work:
int my/**/variable;  // compiler sees: int my variable; → ERROR

Comments and Strings — An Important Distinction

Comment markers inside string literals are NOT treated as comments:

c example

#include <stdio.h>

int main() {
    // The // and /* inside strings are just characters
    printf("Visit http://example.com\n");
    printf("/* This is NOT a comment */\n");
    printf("Use // for single-line comments\n");
    return 0;
}

Output

Visit http://example.com
/* This is NOT a comment */
Use // for single-line comments

The compiler correctly identifies that these are inside string literals and treats them as regular characters.

Interview Questions on Comments in C

Q1: What are the two types of comments in C? Which one was added later?

C has block comments (/* ... */) and single-line comments (// ...). Block comments were part of C from the beginning (K&R C). Single-line comments were officially added in the C99 standard, though many compilers supported them earlier as a C++ extension.

Q2: Can comments be nested in C? What happens if you try?

Multi-line comments (/* */) cannot be nested in C. The first */ encountered ends the comment, regardless of any opening /* inside it. This causes a compilation error if there's code after the premature ending. The workaround is to use #if 0 ... #endif to disable blocks containing comments.

Q3: Do comments affect program performance?

No. Comments are completely removed during the preprocessing phase (replaced by a single space). They don't increase binary size, slow down execution, or affect memory usage in any way.

Q4: What is the difference between #if 0 and commenting out code?

#if 0 ... #endif is processed by the preprocessor and correctly handles any content between the directives, including nested /* */ comments. Regular /* */ comments cannot be nested, so they may fail if the disabled block already contains block comments. #if 0 is the preferred method for disabling large code sections.

Q5: Is // legal in C89/C90?

No, single-line comments (//) are not part of the C89/C90 standard. They were officially introduced in C99. However, most modern compilers (like GCC and Clang) support them even in C89 mode as an extension. If strict ANSI compliance is required, use only /* */ comments.

Summary

Comments are non-executable notes for human readers — the compiler ignores them completely.
C supports single-line (//) and multi-line (/* */) comments.
Single-line comments extend from // to the end of the line.
Multi-line comments span from /* to the next */ and cannot be nested.
Use #if 0 ... #endif to safely disable code blocks that contain comments.
Good comments explain *why* something is done, not *what* the code does.
Comments don't affect program performance — they're removed during preprocessing.
Follow consistent commenting styles for file headers, function docs, and inline notes.
Avoid over-commenting, stale comments, and permanently commented-out code.

Exam Focus

Revise definitions, diagrams, examples, and short-answer points for Comments in C Programming.

Interview Use

Prepare one clear explanation, one practical example, and one common mistake for this C Programming topic.

Search Terms

c-programming, c programming, programming, basics, comments, comments in c programming

Continue learning this concept

BasicsKeywords in C ProgrammingComplete guide to all 32 keywords in C programming — categorized by purpose with explanations, usage examples, and comparison tables.BasicsC Syntax Rules — Complete GuideLearn the fundamental syntax rules of C programming — statements, expressions, semicolons, code blocks, whitespace handling, and common syntax errors explained with examples.BasicsConstants in C ProgrammingLearn about constants in C programming — const keyword, #define macro, enum constants, and literal constants with practical examples and best practices.BasicsData Types in CComplete guide to C data types — primary types (int, char, float, double), derived types (arrays, pointers, structures), type modifiers (short, long, signed, unsigned), sizeof operator, type conversion, and memory representation with examples.BasicsIdentifiers in C ProgrammingComplete guide to identifiers in C — naming rules, conventions, valid and invalid examples, and the difference between identifiers and keywords.BasicsStructure of a C ProgramComplete explanation of C program structure — documentation section, preprocessor directives, global declarations, main function, user-defined functions, and how each section works together with practical examples.

PreviousC Syntax Rules — Complete Guide NextConstants in C Programming

C Notes

Comments in C Programming

Learn about comments in C — single-line comments, multi-line comments, best practices, nested comments, and when to use comments effectively in your code.

Writing good comments is a skill that separates amateur programmers from professionals. Let's explore how comments work in C, the different types, and when you should (and shouldn't) use them.

Types of Comments in C

C supports two styles of comments:

Type	Syntax	Introduced In
Multi-line (block) comment	`/* ... */`	Original C (K&R, C89)
Single-line comment	`// ...`	C99 (borrowed from C++)

Single-Line Comments (`//`)

Single-line comments begin with // and continue until the end of that line. Everything after // on the same line is treated as a comment.

c example

#include <stdio.h>

int main() {
    int age = 25;        // stores the user's age
    float gpa = 3.8;    // grade point average

    // Print student information
    printf("Age: %d\n", age);
    printf("GPA: %.1f\n", gpa);

    return 0;  // indicate successful execution
}

Output

Age: 25
GPA: 3.8

When to Use Single-Line Comments

Brief explanations beside a line of code
Temporarily disabling a single line during debugging
Short notes about logic or decisions

c example

int maxRetries = 3;  // server timeout policy requires max 3 retries

// TODO: Add input validation here
// FIXME: This calculation overflows for large inputs

Multi-Line Comments (`/* ... */`)

Multi-line comments start with /* and end with */. Everything between these markers is ignored, regardless of how many lines it spans.

c example

#include <stdio.h>

/*
 * Program: Temperature Converter
 * Author: John Smith
 * Date: 2024-03-15
 * Description: Converts temperature from Celsius to Fahrenheit
 */

int main() {
    float celsius, fahrenheit;

    /* Get temperature input from user */
    printf("Enter temperature in Celsius: ");
    scanf("%f", &celsius);

    /*
     * Conversion formula:
     * F = (C × 9/5) + 32
     */
    fahrenheit = (celsius * 9.0 / 5.0) + 32.0;

    printf("%.2f°C = %.2f°F\n", celsius, fahrenheit);

    return 0;
}

Output

Enter temperature in Celsius: 100
100.00°C = 212.00°F

When to Use Multi-Line Comments

File headers (author, date, description)
Function documentation explaining parameters and return values
Disabling multiple lines of code during debugging
Complex algorithm explanations

Commenting Out Code (for Debugging)

One common use of comments is temporarily disabling code while debugging. Both comment styles work for this purpose.

c example

#include <stdio.h>

int main() {
    int x = 10, y = 20;

    // Temporarily disabled for testing
    // x = getUserInput();
    // y = getUserInput();

    /*
    printf("Debug info:\n");
    printf("x address: %p\n", &x);
    printf("y address: %p\n", &y);
    */

    printf("Sum: %d\n", x + y);
    return 0;
}

Output

Sum: 30

Pro tip: Version control (like Git) is a better alternative to commenting out code. Commented-out code clutters the file and often stays forever.

Nested Comments in C

A very important thing to know: C does not support nested multi-line comments. The first */ encountered will end the comment, regardless of any opening /* inside.

c example

/* This is a comment
   /* This nested comment BREAKS things */
   This line causes a compilation error! */

Here's what the compiler sees:

Example

/* This is a comment /* This nested comment BREAKS things */ ← comment ENDS here This line causes a compilation error! */ ← ERROR: unexpected code

Workaround for Nested Comments

If you need to comment out a block that already contains /* */ comments, use // for the outer layer or #if 0:

c example

// Method 1: Use single-line comments
// /* Original comment */
// int x = 10;
// int y = 20;

// Method 2: Use preprocessor directive (preferred)
#if 0
/* Original comment */
int x = 10;
int y = 20;
#endif

The #if 0 ... #endif approach is widely used because:

It handles nested comments correctly
It supports any content between the directives
It clearly signals "this code is disabled"

Comment Styles and Formatting

File Header Comment

c example

/************************************************************
 * File: calculator.c
 * Author: Jane Doe
 * Date: 2024-06-10
 * Description: Basic arithmetic calculator with error handling
 * Version: 2.1
 ************************************************************/

Function Documentation Comment

c example

/**
 * Calculates the factorial of a non-negative integer.
 *
 * @param n  The non-negative integer (must be <= 20 to avoid overflow)
 * @return   The factorial of n, or -1 if n is negative
 */
long factorial(int n) {
    if (n < 0) return -1;
    if (n == 0) return 1;
    return n * factorial(n - 1);
}

Inline Comments

Example

Section Separators

c example

/* ===================== */
/*   HELPER FUNCTIONS    */
/* ===================== */

void helperOne() { /* ... */ }
void helperTwo() { /* ... */ }

/* ===================== */
/*   MAIN LOGIC          */
/* ===================== */

int main() { /* ... */ }

Best Practices for Writing Comments

DO ✓

Explain WHY, not WHAT — the code shows what; comments should explain reasoning.

c example

// ✓ GOOD: explains why
int timeout = 30;  // 30 seconds per network team's SLA requirement

// ✗ BAD: just repeats the code
int timeout = 30;  // set timeout to 30

Keep comments updated — stale comments that don't match the code are worse than no comments.

Comment complex logic — algorithms, formulas, and non-obvious decisions deserve explanation.

c example

// ✓ GOOD: explains non-obvious formula
// Using Bresenham's algorithm for efficient integer-only line drawing
int d = 2 * dy - dx;

Use TODO/FIXME markers for known issues or planned improvements.

c example

// TODO: Replace with hash table for O(1) lookup
// FIXME: This fails when input array is empty
// HACK: Temporary workaround until API v2 is released

Document function interfaces — parameters, return values, side effects.

DON'T ✗

Don't state the obvious — trust readers to understand basic C.

Example

// ✗ BAD: painfully obvious i++; // increment i by 1

Don't comment every single line — over-commenting clutters code.

Don't leave commented-out code permanently — use version control instead.

Don't write novels — be concise and clear.

Practical Example: Well-Commented Program

Example

Output

First 10 prime numbers:
2 3 5 7 11 13 17 19 23 29

How the Compiler Handles Comments

During the preprocessing phase (before actual compilation), all comments are replaced with a single space. This means comments have zero impact on:

Program size (binary file)
Execution speed
Memory usage

Example

/* Before preprocessing */ int/*comment*/x = 5; /* After preprocessing */ int x = 5;

This also means you cannot use comments to create tokens:

c example

// This does NOT work:
int my/**/variable;  // compiler sees: int my variable; → ERROR

Comments and Strings — An Important Distinction

Comment markers inside string literals are NOT treated as comments:

c example

#include <stdio.h>

int main() {
    // The // and /* inside strings are just characters
    printf("Visit http://example.com\n");
    printf("/* This is NOT a comment */\n");
    printf("Use // for single-line comments\n");
    return 0;
}

Output

Visit http://example.com
/* This is NOT a comment */
Use // for single-line comments

The compiler correctly identifies that these are inside string literals and treats them as regular characters.

Interview Questions on Comments in C

Q1: What are the two types of comments in C? Which one was added later?

Q2: Can comments be nested in C? What happens if you try?

Q3: Do comments affect program performance?

No. Comments are completely removed during the preprocessing phase (replaced by a single space). They don't increase binary size, slow down execution, or affect memory usage in any way.

Q4: What is the difference between #if 0 and commenting out code?

Q5: Is // legal in C89/C90?

Summary

Comments are non-executable notes for human readers — the compiler ignores them completely.
C supports single-line (//) and multi-line (/* */) comments.
Single-line comments extend from // to the end of the line.
Multi-line comments span from /* to the next */ and cannot be nested.
Use #if 0 ... #endif to safely disable code blocks that contain comments.
Good comments explain *why* something is done, not *what* the code does.
Comments don't affect program performance — they're removed during preprocessing.
Follow consistent commenting styles for file headers, function docs, and inline notes.
Avoid over-commenting, stale comments, and permanently commented-out code.

Exam Focus

Revise definitions, diagrams, examples, and short-answer points for Comments in C Programming.

Interview Use

Prepare one clear explanation, one practical example, and one common mistake for this C Programming topic.

Search Terms

c-programming, c programming, programming, basics, comments, comments in c programming

Continue learning this concept

PreviousC Syntax Rules — Complete Guide NextConstants in C Programming

Types of Comments in C

Single-Line Comments (//)

When to Use Single-Line Comments

Multi-Line Comments (/* ... */)

When to Use Multi-Line Comments

Commenting Out Code (for Debugging)

Nested Comments in C

Workaround for Nested Comments

Comment Styles and Formatting

File Header Comment

Function Documentation Comment

Inline Comments

Section Separators

Best Practices for Writing Comments

DO ✓

DON'T ✗

Practical Example: Well-Commented Program

How the Compiler Handles Comments

Comments and Strings — An Important Distinction

Interview Questions on Comments in C

Summary

Continue learning this concept

Types of Comments in C

Single-Line Comments (//)

When to Use Single-Line Comments

Multi-Line Comments (/* ... */)

When to Use Multi-Line Comments

Commenting Out Code (for Debugging)

Nested Comments in C

Workaround for Nested Comments

Comment Styles and Formatting

File Header Comment

Function Documentation Comment

Inline Comments

Section Separators

Best Practices for Writing Comments

DO ✓

DON'T ✗

Practical Example: Well-Commented Program

How the Compiler Handles Comments

Comments and Strings — An Important Distinction

Interview Questions on Comments in C

Summary

Continue learning this concept

Single-Line Comments (`//`)

Multi-Line Comments (`/* ... */`)

Single-Line Comments (`//`)

Multi-Line Comments (`/* ... */`)