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C Programs

• C Programs
• C Programs - Home

• Basics of C Programming (Introductory Programs)

• Hello World
• Print your name, age, and address
• Display "C Programming is Powerful"
• Input and display integer, float, and character
• Swap two numbers (using third variable)
• Swap two numbers (without third variable)
• Find ASCII value of a character
• Find size of data types (int, float, etc.)
• Convert Celsius to Fahrenheit
• Convert Fahrenheit to Celsius
• Convert kilometers to miles
• Area and perimeter of a rectangle
• Area and circumference of a circle
• Menu-Driven Shape Calculations
• Menu-Driven Geometry Calculations
• Menu-Driven Extended Geometry Calculations
• Volume of a cube
• Volume of a cylinder
• Simple interest calculation
• Compound interest calculation
• Calculate gross salary
• Convert days to years, weeks, days
• Evaluate arithmetic expression
• Display ASCII table

• Control Statements & Loops in C

• Decision Making Programs in C

(using if, if-else, nested if, switch-case)

• Check whether a number is positive, negative, or zero
• Check whether a number is even or odd
• Find the largest of two numbers
• Find the largest of three numbers
• Check whether a year is a leap year
• Check whether a character is a vowel or consonant
• Check whether a character is uppercase, lowercase, digit, or special symbol
• Find the grade of a student (marks-based)
• Check whether a person is eligible to vote
• Find absolute value of a number
• Simple calculator using if-else
• Simple calculator using switch-case
• Print day of week (switch-case)
• Check whether triangle is valid (angles sum = 180)
• Check whether triangle is equilateral, isosceles, or scalene
• Find roots of quadratic equation
• Electricity bill calculation (slab-based)
• Calculate bonus for employee based on salary & service years
• Check whether a character is alphabet or not
• Check whether a number is divisible by 5 and 11
• Menu-driven program: area of circle, rectangle, triangle
• Find greatest among four numbers (nested if)
• Loop Programs in C

(using for, while, do-while loops)

• Print first N natural numbers
• Print first N even numbers
• Print first N odd numbers
• Print multiplication table of a number
• Print sum of first N natural numbers
• Print sum of first N even numbers
• Print sum of first N odd numbers
• Print factorial of a number (loop)
• Generate Fibonacci series up to N terms
• Print reverse of a number
• Count digits in a number
• Sum of digits of a number
• Product of digits of a number
• Check whether a number is palindrome (loop)
• Check whether a number is Armstrong (loop)
• Check whether a number is prime (loop)
• Print all prime numbers between 1 and N
• Print all Armstrong numbers between 1 and N
• Print all palindrome numbers in a given range
• Print all factors of a number
• Find HCF (GCD) of two numbers (loop)
• Find LCM of two numbers (loop)
• Print pyramid pattern (star *)
• Print inverted pyramid pattern
• Print Floyd’s triangle (1, 2, 3…)
• Print Pascal’s triangle (loop)

• Functions

• Function to add two numbers
• Function to subtract two numbers
• Function to multiply two numbers
• Function to divide two numbers
• Function for factorial (iteration)
• Factorial (recursion)
• Fibonacci (recursion)
• GCD using function
• LCM using function
• Swap numbers using function
• Prime number check using function
• Palindrome check using function
• Armstrong check using function
• Function returning array maximum
• Recursive sum of digits
• Recursive reverse of number
• Recursive power calculation
• Function to check strong number
• Function for perfect number
• Function overloading using macros (simulate)
• Nested function calls example

• Arrays

• Input and display array elements
• Sum of array elements
• Average of array elements
• Maximum in array
• Minimum in array
• Linear search
• Binary search
• Bubble sort
• Selection sort
• Insertion sort
• Merge two arrays
• Copy array to another
• Reverse array elements
• Count even and odd numbers in array
• Frequency of array elements
• Remove duplicate elements
• Find second largest element
• Find second smallest element
• Rotate array left
• Rotate array right
• Matrix addition (2D array)
• Matrix multiplication (2D array)
• Transpose of a matrix

• Strings

• Input and display string
• Find string length (without strlen())
• Copy string (without strcpy())
• Concatenate two strings
• Compare two strings
• Reverse string
• Check palindrome string
• Count vowels, consonants
• Count digits, spaces, special chars
• Count words in string
• Convert string to uppercase
• Convert string to lowercase
• Toggle case of characters
• Find frequency of characters
• Remove vowels from string
• Remove spaces from string
• Remove duplicate characters
• Check anagram strings
• Sort characters in string
• Sort array of strings
• Longest word in a sentence
• Shortest word in a sentence

• Pointers

• Pointer basics (address, value)
• Pointer arithmetic
• Add two numbers using pointers
• Swap numbers using pointers
• Sum of array using pointers
• Find length of string using pointers
• Reverse string using pointers
• Compare two strings using pointers
• Concatenate strings using pointers
• Pointer to pointer (double pointer)
• Function returning pointer
• Pass array to function using pointers
• Dynamic array with pointers
• Matrix addition using pointers
• Matrix multiplication using pointers
• Pointer to structure
• Access structure elements with pointer
• Array of pointers
• String array with pointers
• Pointer and function (call by reference)
• Swap two arrays using pointers

• Structures and Unions

• Student structure (input & display)
• Array of structures (students list)
• Nested structures (employee with address)
• Passing structure to function
• Returning structure from function
• Complex number addition using structures
• Compare two dates using structures
• Bank account management (structure)
• Store book details using structure
• Store employee details (salary, age, etc.)
• Find student with highest marks (array of structures)
• Sort students by marks
• Union example (memory sharing)
• Difference between union & structure (demo)
• Store cricket players’ details
• Store car details (company, model, price)
• Store hospital patient details
• Online shopping cart using structures
• Store weather report data
• Library management using structures
• Store exam records with pass/fail result

• Dynamic Memory Allocation

• Allocate array using malloc()
• Allocate array using calloc()
• Reallocate array using realloc()
• Free memory using free()
• Input & print dynamic array
• Average of dynamic array
• Dynamic string input
• Reverse string using dynamic memory
• Dynamic matrix allocation
• Matrix addition using dynamic memory
• Matrix multiplication using dynamic memory
• Dynamic structure allocation (student info)
• Linked list creation with malloc()
• Insert node dynamically in linked list
• Delete node dynamically in linked list
• Stack using dynamic memory
• Queue using dynamic memory
• Dynamic 2D array (pointer-to-pointer)
• Dynamic array resizing at runtime
• Dynamic sorting of array
• Dynamic string concatenation

• File Handling

• Create and write to a file
• Read from a file
• Append to a file
• Copy file contents
• Count characters in file
• Count words in file
• Count lines in file
• Count vowels/consonants in file
• Check whether file exists
• Merge two files into one
• Find frequency of a word in file
• Store student records in file
• Retrieve student records from file
• Update student record in file
• Delete student record from file
• Sort student records stored in file
• Encrypt file content
• Decrypt file content
• Find largest word in a file
• Find smallest word in a file
• Store employee payroll system in file
• Implement mini database using file handling

• Data Structures in C

• Singly linked list creation
• Display linked list
• Insert node at beginning
• Insert node at end
• Insert node at position
• Delete node from beginning
• Delete node from end
• Delete node by value
• Search element in linked list
• Count nodes in linked list
• Reverse linked list
• Doubly linked list creation
• Circular linked list creation
• Stack using array
• Stack using linked list
• Queue using array
• Queue using linked list
• Circular queue implementation
• Binary tree creation
• Inorder traversal
• Preorder traversal
• Postorder traversal
• Binary search tree insertion
• BST search element
• Graph representation (adjacency matrix)
• BFS (Breadth First Search)
• DFS (Depth First Search)
• Bubble sort
• Quick sort
• Merge sort
• Heap sort
• Binary search
• Hash table basics

• Advanced C Programs

• Command line arguments sum
• Command line arguments word count
• Display environment variables
• Bitwise AND, OR, XOR
• Bitwise left shift, right shift
• Check if number is power of 2
• Find number of set bits (Brian Kernighan’s algorithm)
• Endianness check
• Macro definition demo
• Create header file and include it
• Error handling using errno
• Pointer to function example
• Function pointer for callback
• Matrix multiplication (optimized)
• Sparse matrix representation
• Polynomial addition using linked list
• Polynomial multiplication using linked list
• Mini calculator with functions + switch
• Tic-tac-toe game
• Snake game (console-based)
• Student grading system with structures + files
• Hospital management mini project
• Bank management mini project

• User-Defined Number Programs in C

• Check whether a number is even or odd
• Find the largest of two numbers (without built-in max)
• Find the largest of three numbers
• Check whether a number is prime
• Display all prime numbers between 1 and N
• Check whether a number is palindrome
• Check whether a number is Armstrong
• Find factorial of a number (loop)
• Factorial using recursion
• Generate Fibonacci series (loop)
• Generate Fibonacci series (recursion)
• Reverse a number
• Sum of digits of a number
• Product of digits of a number
• Count digits in a number
• Find GCD of two numbers (loop)
• Find LCM of two numbers
• Check whether a number is strong (sum of factorial of digits = number)
• Check whether a number is perfect (sum of divisors = number)
• Find power of a number (without pow())
• Convert decimal to binary
• Convert binary to decimal
• Convert octal to decimal
• Convert decimal to octal
• Convert decimal to hexadecimal
• Check whether number is automorphic (square ends with same digits)
• Check whether number is neon (sum of digits of square = number)
• Print factors of a number
• Sum of N natural numbers (loop)
• Sum of N natural numbers (recursion)

• User-Defined String Programs in C

• Find length of a string (without strlen())
• Copy one string to another (without strcpy())
• Concatenate two strings (without strcat())
• Compare two strings (without strcmp())
• Reverse a string (user-defined)
• Check whether a string is palindrome
• Convert string to uppercase (without strupr())
• Convert string to lowercase (without strlwr())
• Toggle case of each character
• Count vowels in a string
• Count consonants in a string
• Count digits in a string
• Count special characters in a string
• Count words in a string
• Remove all vowels from a string
• Remove all spaces from a string
• Remove duplicate characters
• Frequency of each character in string
• Find the longest word in a sentence
• Find the shortest word in a sentence
• Sort characters of string in ascending order
• Sort array of strings alphabetically
• Check whether two strings are anagrams
• Find first non-repeating character
• Replace a character in a string with another
• Remove particular character from string
• Count occurrences of a given word in string
• Check substring existence (without strstr())
• Extract substring (user-defined)
• Rotate string left/right by N characters