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C Tutorial
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Print "Hello" without ;
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Number in Characters
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Hexadecimal to Binary
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Octal to Hexadecimal in C
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itoa Function in C
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Modulus Operator in C/C++
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C Program to convert 24 Hour time to 12 Hour time
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Bank Account Management System
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8th Sep - Calendar Application in C
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Student Record System in C
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Cricket Score Sheet in C
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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
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Department Management System in C
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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
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Number of even and odd numbers in a given range
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Peak element in the Array in C
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Segregate 0s and 1s in an array
Articulation Points and Bridges
Execution of printf with ++ Operators
Understanding the extern Keyword in C
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FIFO Page Replacement Algorithm in C
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FCFS Program in C
Triple DES Algorithm in C
Window Sliding Technique in C
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C Program to Demonstrate fork() and pipe()
Deadlock Prevention using Banker's Algorithm in C
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Algorithm in C language
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Adaline Program in C
Adam Number in C Program
Adam Number or not in C Program
Add 2 Matrix in C
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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
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CRC program in C
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Transpose of Matrix in C
Actual and Formal Parameters in C
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Difference between C and Embedded C
Dynamic Array in C
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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
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SJF Scheduling program in C
Stdlib.h in C
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What is a Storage Class in C
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Insertion Sort in C
Queue in C
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FUNCTION PROTOTYPE IN C
Iteration in C
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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
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System function in C
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Execlp() function in C
Fabs() function in C
Recursive Descent Parser Program in C
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Skill rack solution in C
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Stdin and Stdout in C
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Strsep() function in C
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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
MCQ
Math
Prime Numbers List
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Ounces in a Cup
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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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