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C Tutorial
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printf scanf
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Classification of Programming Languages
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C Programming Test
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Fibonacci Series
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C program to compare the two strings
Strings Concatenation in C
Factorial
Armstrong Number
Sum of digits
Count the number of digits in C
Reverse Number
Swap Number
Print "Hello" without ;
Assembly code in C
C program without main
Matrix Multiplication
Decimal to Binary
Number in Characters
Alphabet Triangle
Number Triangle
Fibonacci Triangle
Hexadecimal to Binary
Hexadecimal to Decimal
Octal to Hexadecimal in C
Strong number in C
Star Program in C
itoa Function in C
Extra Long Factorials in C
Leap year program in C
Perfect Number Program in C
Variables vs Constants
Round Robin Program in C with Output
C Program to find the roots of quadratic equation
Type Casting vs Type Conversion
How to run a C program in Visual Studio Code
Modulus Operator in C/C++
Sum of first N natural numbers in C
Big O Notation in C
LCM of two numbers in C
while loop vs do-while loop in C
Memory Layout in C
Balanced Parenthesis in C
Binary to Decimal Number in C
GCD of two numbers in C
Getchar() function in C
flowchart in C
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Random Function in C
Floyd's Triangle in C
C Header Files
abs() function in C
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Structure Pointer in C
sprintf() in C
Range of Int in C
C Program to convert 24 Hour time to 12 Hour time
What is double in C
What is the main in C
Calculator Program in C
Calloc in C
user-defined vs library function in C
Memset C
ASCII Table in C
Static function in C
Reverse a String in C
Twin Prime Numbers in C
strchr() function in C
Structure of a C program
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Convert Uppercase to Lowercase in C
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Ceil Function in C
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Self-referential structure
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Abort() Function in C
Assert in C
Floor() Function in C
memcmp() in C
Find Day from Day in C without Using Function
Find Median of 1D Array Using Functions in C
Find Reverse of an Array in C Using Functions
Find Occurrence of Substring in C using Function
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Exponential() in C
Float in C
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memcpy() in C
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Matrix Calculator in C
Bank Account Management System
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8th Sep - Calendar Application in C
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8th Sep - Ascii vs Unicode
Student Record System in C
Contact Management System in C
Cricket Score Sheet in C
C/C++ Tricky Programs
Clearing the Input Buffer in C/C++
In-place Conversion of Sorted DLL to Balanced BST
Merge Two Balanced Binary Search Trees
Responsive Images in Bootstrap with Examples
Why can't a Priority Queue Wrap around like an Ordinary Queue
Customer Billing System in C
Builtin functions of GCC compiler
Integer Promotions in C
Bit Fields in C
Department Management System in C
Local Labels in C
School Billing System in C
Banking Account System in C using File handling
Data Structures and Algorithms in C - Set 1
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Employee Record System in C
Hangman Game in C
Hospital Management System in C
Number of even and odd numbers in a given range
qsort() in C
Quiz game in C
An Array of Strings in C
Peak element in the Array in C
Move all negative elements to one side of an Array-C
Reverse an Array in C
3 way merge sort in c
Segregate 0s and 1s in an array
Articulation Points and Bridges
Execution of printf with ++ Operators
Understanding the extern Keyword in C
Banker's Algorithm in C
FIFO Page Replacement Algorithm in C
Kruskal's Algorithm in C
FCFS Program in C
Triple DES Algorithm in C
Window Sliding Technique in C
Sleeping Barber Problem Solution in C
How to Add Matrix in C
C Program to Demonstrate fork() and pipe()
Deadlock Prevention using Banker's Algorithm in C
Simple Stopwatch Program in C
Add Node to Linked List in C
How to Add two Array in C
Algorithm in C language
Add Digits of Number in C
Add Element in Array in C
Add String in C
Add Two Matrices in C
Add two numbers using Pointer in C
Order of Complexity in C
Pattern Matching Algorithm in C
Adaline Program in C
Adam Number in C Program
Adam Number or not in C Program
Add 2 Matrix in C
Add 2 Strings in C
Add a Character to a String in C
Best Compiler for C Programming
C Program to Convert Infix to Postfix
C Program For Printing Inverted Pyramid
Control String in C Language
How to Find Time Complexity of a Program in C
Top C Projects in 2023
Convert a Char Array into a Double in C
Conio.h in C
Decision-Making Statements in C
What is Hashing in C
Bubble sort program in C
Comma Operator in C
Control Statements in C
ctype.h in C
First Fit Algorithm in C
Hello World Program in C
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Memory leak in C
Null character in C
Operator precedence in C
Putchar() function in C
Quick Sort in C
realloc in C
Special operator in C
Volatile Keyword in C
CRC program in C
Binary search algorithm in C
Kruskal algorithm in C
Transpose of Matrix in C
Actual and Formal Parameters in C
Bit Stuffing in C
Difference between C and Embedded C
Dynamic Array in C
Jump statement in C
Multidimensional array in C
Priority scheduling program in C
Pseudo code in C
Data Structure in C
Difference between switch statement and if-else-if ladder statement in C
BFS Program in C
Nested if else statement in C
Pattern Programs in C
SJF Scheduling program in C
Stdlib.h in C
User defined function in C
How to use Pointers in C language
What is a Storage Class in C
What is short int in C
Insertion Sort in C
Queue in C
Segmentation Fault in C
FUNCTION PROTOTYPE IN C
Iteration in C
One dimensional array in C
Overview of Structures and Unions in C
Difference between 1D and 2D array in C
Differences between Float and Double in C
Fizz Buzz Program in C
Formatted and Unformatted Input Output in C
Garbage collection in C
Library function in C
Strtok() function in C
Symbolic Constants in C
What is Garbage Value in C
What is size_t in C
What is the use of "\r" in C
Address operator in C
BOOTHS Algorithm in C
Character stuffing program in C
Difference between printf() and scanf() in C
Global Variable in C
Lexical Analyzer in C
Pascal Triangle in C
Postfix Evaluation in C
Strncmp() function in C
Type Qualifiers in C
Unsigned int in C
What is Perror in C
Difference Between Array and String in C
Execvp() Function in C
Explain Recursion with Example in C
Contiguous file allocation program in C
ENTRY CONTROL LOOP IN C
EXIT CONTROL LOOP IN C
Fopen() function in C
Hollow Diamond Pattern in C
Register Keyword in C
Strcmpi() function in C
Strtol() function in C
System function in C
Difference between parameter and arguments in C
Execlp() function in C
Fabs() function in C
Recursive Descent Parser Program in C
Difference Between exit() and return() in C
Skill rack solution in C
Stack overflow in C
Static_cast in C
Stdin and Stdout in C
Strrchr() function in C
Strsep() function in C
Strcspn() function in C
Strtoul() Function in C
Area of Circle program in C
Branching statements in C
Bubble Sort in C
C program to adding of two binary numbers
C program to Search an Element in an Array
Difference between Object code and Source code
Electricity bill program in C
RSA algorithm in C
Singly linked list in C
Stack in C
Strcspn() function in C
Strftime() in C
Strlen() function in C
Swap first and last digit of a number in C
Addition program in C
clrscr in C
Distance Vector Routing Program in C
Even odd programs in C
How to Access Structure Members in C
How to Change C Users Username in Windows 10
Linear search in C
Symmetric Matrix in C
fgets() function in C
Length of array in C
MULTITHREADING IN C
Number pattern program in C
Strcpy() function in C
Best Books for C Programming
C Program to Calculate Area and Circumference of Circle
Character Set in C
Array Rotation in C
Random Access File in C
atan2() Function in C
Digital Clock in C Programming
How Many IP Addresses have a class c Network
How Many Tokens in C
Linked error in C
Lvalue and Rvalue in C
Auto and Static Variable in C
feof() function in C
Gauss Jordan Method in C
Gauss Seidel Method in C
Getw() and Putw() function in C
lseek() in C
usleep() function in C
First and Follow Program in C
Interpolation Search in C
strdup() function in C
Generic Keyword in C
getopt() function in C
getpid() and getppid() function in C
Magic Square Function in C
Reentrant Function in C
Return Statement in C
Travelling Salesman Problem in C
Double Float in C
fseek() vs rewind() in C
How to create your own header files in C
Implicit type conversion in C
Inter Function Communication in C
kbhit() in C
Multiline Macros in C
Scanset in C
Tail Recursion in C
C program for currency denomination
C program for secant method
Fread() Function in C
Hangman game program in C
Hilbert curve program in C
Newton Forward Interpolation in C
Tower of Hanoi
Vigenere Cypher Program in C
MCQ
Math
Prime Numbers List
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Square Numbers List
Binary Numbers List
Fibonacci Numbers List
Ounces in a Cup
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Ounces in a Quart
Ounces in a Tablespoon
C Interview
C #ifndefThe #ifndef preprocessor directive checks if macro is not defined by #define. If yes, it executes the code otherwise #else code is executed, if present. Syntax: Syntax with #else: C #ifndef exampleLet's see a simple example to use #ifndef preprocessor directive. Output: Enter a:5 Value of a: 5 But, if you don't define INPUT, it will execute the code of #ifndef. Output: Value of a: 2
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