C Programs - C Programming Examples (2025)

C Programs: Practicing and solving problems is the best way to learn anything. Here, we have provided 100+ C programming examples in different categories like basic C Programs, Fibonacci series in C, String, Array, Base Conversion, Pattern Printing, Pointers, etc. These C programs are the most asked interview questions from basic to advanced level.

C Program Topics:

C Program – Basic

1. C Hello World Program
2. C Program to Print Your Own Name
3. C Program to Print an Integer Entered By the User
4. C Program to Add Two Numbers
5. C Program to Check Whether a Number is Prime or Not
6. C Program to Multiply two Floating-Point Numbers
7. C Program to Print the ASCII Value of a Character
8. C Program to Swap Two Numbers
9. C Program to Calculate Fahrenheit to Celsius
10. C Program to Find the Size of int, float, double, and char
11. C Program to Add Two Complex Numbers
12. CProgram to Print Prime Numbers From 1 to N
13. C Program to Find Simple Interest
14. C Program to Find Compound Interest
15. C Program for Area And Perimeter Of Rectangle

C Program – Control Flow

1. C Program to Check Whether a Number is Positive, Negative, or Zero
2. C Program to Check Whether Number is Even or Odd
3. C Program to Check Whether a Character is Vowel or Consonant
4. C Program to Find Largest Number Among Three Numbers
5. C Program to Calculate Sum of Natural Numbers
6. C Program to Print Alphabets From A to Z Using Loop
7. C Program to Check Leap Year
8. C Program to Find Factorial of a Number
9. C Program to Make a Simple Calculator
10. C Program to Generate Multiplication Table
11. C Program to Print Fibonacci Series
12. CProgram to Find LCM of Two Numbers
13. C Program to Check Armstrong Number
14. C Program to Display Armstrong Numbers Between 1 to 1000
15. C Program to Display Armstrong Number Between Two Intervals
16. C Program to Reverse a Number
17. C Program to Check Whether a Number is a Palindrome or Not
18. C Program to Check Whether a Number is Prime or Not
19. C Program to Display Prime Numbers Between Intervals
20. CProgram to Check whether the input number is a Neon Number
21. C Program to Find All Factors of a Natural Number
22. Cprogram to Sum of Fibonacci Numbers at Even Indexes up to N Terms

C Program – Pattern Printing

1. C Program to Print Simple Pyramid Pattern
2. C Program to Print Given Triangle
3. C Program to Print 1800 Rotation of Simple Pyramid
4. C Program to Print Inverted Pyramid
5. C Program to Print Number Pattern
6. C Program to Print Character Pattern
7. C Program to Print Continuous Character Pattern
8. C Program to Print Hollow Star Pyramid
9. C Program to Print Inverted Hollow Star pyramid
10. C Program to Print Hollow Star Pyramid in a Diamond Shape
11. C Program to Print Full Diamond Shape Pyramid
12. C Program to Print Pascal’s Pattern Triangle Pyramid
13. C Program to Print Floyd’s Pattern Triangle Pyramid
14. C Program to Print Reverse Floyd pattern Triangle Pyramid

C Program – Functions

1. C Program to Check Prime Number By Creating a Function
2. C Program to Display Prime Numbers Between Two Intervals Using Functions
3. C Program to Find All Roots of a Quadratic Equation
4. C Program to Check Whether a Number can be Express as Sum of Two Prime Numbers
5. C Program to Find the Sum of Natural Numbers using Recursion
6. C Program to Calculate the Factorial of a Number Using Recursion
7. C Program to Find G.C.D Using Recursion
8. C Program to Reverse a Stack using Recursion
9. C Program to Calculate Power Using Recursion

C Program – Arrays

1. C Program to Print a 2D Array
2. C Program to Find the Largest Element in an Array
3. C Program to Find the Maximum and Minimum in an Array
4. C Program to Search an Element in an Array (Binary search)
5. C Program to Calculate the Average of All the Elements Present in an Array
6. C Program to Sort an Array using Bubble Sort
7. C Program to Sort an Array using Merge Sort
8. C Program to Sort an Array Using Selection Sort
9. C Program to Sort an Array Using Insertion Sort
10. C Program to Sort the Elements of an Array in Descending Order
11. C Program to Sort the Elements of an Array in Ascending Order
12. C Program to Remove Duplicate Elements From a Sorted Array
13. C Program to Merge Two Arrays
14. C Program to Remove All Occurrences of an Element in an Array
15. C Program to Find Common Array Elements
16. C Program to Copy All the Elements of One Array to Another Array
17. C Program For Array Rotation
18. C Program to Sort the 2D Array Across Rows
19. C Program to Check Whether Two Matrices Are Equal or Not
20. C Program to Find the Transpose
21. C Program to Find the Determinant of a Matrix
22. C Program to Find the Normal and Trace
23. C Program to Add Two Matrices
24. C Program to Multiply Two Matrices
25. C Program to Print Boundary Elements of a Matrix
26. C Program to Rotate Matrix Elements
27. C Program to Compute the Sum of Diagonals of a Matrix
28. C Program to Interchange Elements of First and Last in a Matrix Across Rows
29. C Program to Interchange Elements of First and Last in a Matrix Across Columns

C Program – Strings

1. C Program to Add or Concatenate Two Strings
2. C Program to Add 2 Binary Strings
3. C Program to Get a Non-Repeating Character From the Given String
4. C Program to check if the string is palindrome or not
5. C Program to Reverse an Array or String
6. C program to Reverse a String Using Recursion
7. C Program to Find the Length of a String
8. C Program to Sort a String
9. C Program to Check For Pangram String
10. C Program to Print the First Letter of Each Word
11. C Program to Determine the Unicode Code Point at a Given Index
12. C Program to Remove Leading Zeros
13. C Program to Compare Two Strings
14. C Program to Compare Two Strings Lexicographically
15. C Program to Insert a String into Another String
16. C Program to Split a String into a Number of Sub-Strings

C Program – Conversions

1. C Program For Boolean to String Conversion
2. C Program For Float to String Conversion
3. C Program For Double to String Conversion
4. C Program For String to Long Conversion
5. C Program For Long to String Conversion
6. C Program For Int to Char Conversion
7. C Program For Char to Int Conversion
8. C Program For Octal to Decimal Conversion
9. C Program For Decimal to Octal Conversion
10. C Program For Hexadecimal to Decimal Conversion
11. C Program For Decimal to Hexadecimal Conversion
12. C Program For Decimal to Binary Conversion
13. C Program For Binary to Decimal Conversion

C Program – Pointers

1. How to Return a Pointer from a Function in C
2. How to Declare a Two-Dimensional Array of Pointers in C?
3. C Program to Find the Largest Element in an Array using Pointers
4. C Program to Swap Two Numbers
5. C Program to Sort an Array using Pointers
6. C Program to Sort a 2D Array of Strings
7. C Program to Check if a String is a Palindrome using Pointers
8. C Program to Create a Copy of a Singly Linked List using Recursion

C Program – Structures and Unions

1. C Program to Store Information of Students Using Structure
2. C Program to Store Student Records as Structures and Sort them by Name
3. C Program to Add N Distances Given in inch-feet System using Structures
4. C Program to Add Two Complex Numbers by Passing Structure to a Function
5. C Program to Store Student Records as Structures and Sort them by Age or ID
6. Read/Write Structure to a File in C
7. Flexible Array Members in a Structure in C

C Program – File IO

1. C Program to Create a Temporary File
2. C Program to Read/Write Structure to a File
3. C Program to Rename a file
4. C Program to Make a File Read-Only
5. C program to Compare Two Files and Report Mismatches
6. C Program to Copy One File into Another File
7. C Program to Print all the Patterns that Match Given Pattern From a File
8. C Program to Append the Content of One Text File to Another
9. C Program to Read Content From One File and Write it Into Another File
10. C Program to Read and Print all Files From a Zip File

C Program – Date and Time

1. C Program to Format time in AM-PM format
2. C program to Print Digital Clock with the Current Time
3. C Program to Display Dates of Calendar Year in Different Formats
4. C Program to Display Current Date and Time
5. C Program to Maximize Time by Replacing ‘_’ in a Given 24-Hour Format Time
6. C Program to Convert the Local Time to GMT
7. C Program to Convert Hours into Minutes and Seconds

C Program – More C Programs

1. C Program to Show Runtime exceptions
2. C Program to Show Types of errors
3. C Program to Show Unreachable Code Error
4. C Program to Find Quotient and Remainder
5. C Program to Find the Initials of a Name
6. C Program to Draw a Circle in Graphics
7. Printing Source Code of a C Program Itself

FAQs on C Program

Q1: What is C programming?

Answer:

C is a structured, high-level, and general-purpose programming language, developed in the early 1970s by Dennis Ritchie at Bell Labs. C language is considered as the mother language of all modern programming languages, widely used for developing system software, embedded software, and application software.

Q2: How do I write a “Hello, World!” program in C?

Answer:

To write a “Hello, World!” program in C, you can use the following code:

#include <stdio.h>

int main() {
printf(“Hello, World!\n”);
return 0;
}
This code uses the printf function to display the “Hello, World!” message on the screen.

Q3: Why should you learn C Programming?

Answer:

There are many reasons why you should learn C programming:

• Versatility
• Efficiency
• Portability
• Widely used
• Foundation for other languages
• Employment opportunities and more.