C Programming Practice Programs (1–135...)

Introduction

This repository contains a comprehensive collection of C programming practice questions that I have solved while preparing for my C Programming examination.

The programs cover concepts ranging from basic syntax to advanced topics such as structures, unions, dynamic memory allocation, file handling, and pointers.

⚠️ Note:
This repository does NOT contain Data Structures and Algorithms (DSA) problems.

All questions focus strictly on fundamental C programming concepts.

I am sharing this collection so that other students can also practice, revise, and prepare effectively for exams, viva, and practical assessments.

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What This Repository Contains

• questions.txt
  → Contains the complete list of C programming questions with program numbers (Program 1 to Program 135).

• Individual C source files
  → Each program is saved separately using the format:
  program_no.c
  (Example: program_25.c, program_66.c, etc.)

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Topics Covered

• Basic Programming Concepts

  • Input–Output in C
  • Variables and Data Types
  • Operators and Expressions

• Conditional Statements

  • If statement
  • If–else statement
  • Nested if–else
  • Switch case statement

• Looping Constructs

  • For loop
  • While loop
  • Do–while loop
  • Nested loops

• Jump & Loop Control Statements

  • Break statement
  • Continue statement
  • Goto statement
  • Infinite loops

• Mathematical & Logical Programs

  • Factorial of a number
  • Fibonacci series
  • Sum of digits
  • Reverse of a number
  • Sum of first n natural numbers
  • GCD using Euclid’s algorithm
  • Prime number checking
  • Armstrong number
  • Palindrome number
  • Perfect number
  • Leap year checking

• Functions

  • User-defined functions
  • Function with parameters
  • Function with return value
  • Call by value
  • Call by reference

• Recursion

  • Recursive factorial
  • Recursive Fibonacci
  • Recursive sum of digits
  • Recursive reverse of number
  • Recursive power calculation
  • Recursive prime checking

• Arrays

  • One-dimensional arrays
  • Sum and average of array elements
  • Reverse of array
  • Maximum and minimum in array
  • Counting even and odd elements
  • Missing number in array
  • Searching in array

• Sorting Algorithms

  • Bubble Sort
  • Selection Sort
  • Insertion Sort
  • Quick Sort
  • Merge Sort

• Two-Dimensional Arrays & Matrices

  • 2D array basics
  • Matrix addition
  • Matrix multiplication
  • Transpose of matrix
  • Searching in 2D array

• Pattern Printing

  • Star patterns
  • Number patterns
  • Character patterns
  • Inverted patterns
  • Hollow patterns
  • Diamond pattern
  • Butterfly pattern
  • Pascal’s Triangle

• Strings

  • String basics
  • String palindrome
  • String reversal
  • String comparison
  • String copy
  • String concatenation
  • Anagram checking
  • ASCII manipulation (encryption/decryption)
  • Substring extraction

• Structures

  • Structure definition and initialization
  • Array of structures
  • Passing structure to function
  • Pointer to structure
  • Structure for student records
  • Structure for employee records

• Unions

  • Union basics
  • Memory sharing in union
  • Union inside structure

• Typedef

  • Typedef with basic data type
  • Typedef with structure
  • Typedef with pointer

• Enumerations

  • Enum basics
  • Assigning values to enum constants
  • Enum with switch case

• Storage Classes

  • Auto storage class
  • Register storage class
  • Static variable
  • Extern storage class
  • Difference between static and non-static
  • Scope of variables
  • Lifetime of variables

• Dynamic Memory Allocation

  • malloc()
  • calloc()
  • realloc()
  • Dynamic array
  • Dynamic string
  • Dynamic structure
  • Dynamic 2D array

• Pointers

  • Pointer basics
  • Pointer arithmetic
  • Generic pointer (void *)
  • Generic pointer with function

• Self-Referential Structures

  • Self-referential structure basics
  • Declaration and initialization

• File Handling

  • File creation
  • Writing to file
  • Reading from file (character by character)
  • Reading using fgets()
  • Appending data to file
  • Counting characters in file
  • Counting lines in file
  • Copying file contents

• Conversion Programs

  • Celsius to Fahrenheit
  • Fahrenheit to Celsius
  • Decimal to binary

• Simple Application Programs

  • Largest of three numbers
  • Even or odd
  • Grade assignment
  • Calculator using switch
  • Simple interest
  • Compound interest

How to Use This Repository

1. Open the questions.txt file

   • Search for the question you want to practice or revise.

2. Note the Program Number

   • Each question is clearly labeled (e.g., Program 45, Program 72).

3. Open the Corresponding C File

   • Go to the file named program_no.c
     Example:
     • For Program 45, open program_45.c

4. Compile and Run the Program

   gcc program_45.c
   ./a.exe
   

🌐 Connect With Me

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✉️ Email: kd243315@gmail.com