C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast


What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement


What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop


What is Function C User Defined Functions C Recursion C Passing Parameters


Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register


What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings


What is String C String Functions


What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer


What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def


What is Union


What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

C Interview Sets All Star Patterns All Number Patterns All Alphabet Patterns All Series Patterns
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

Comma Operator

What Is Comma Operator?

The comma operator is used to separate two or more expression. Where first expression1 is evaluated, then expression2 is evaluated, and the value of expression2 is returned for the whole expression.

comma operator
#include <stdio.h> //header file section
int main() //main section
int a=5, b=10;
printf("if condition executes");
printf("else condition executes");
return 0;
  • if condition executes


In the above program if condition checks only the right most codition as comma operator sperates two conditions.

Comma Operator Priority

Comma operator has the lowest priority among all the operators.

Comma Operator In printf

Here is an example program where comma operator get used in printf statement.

#include <stdio.h> //header file section
int main() //main section
printf("Addition of 4 + 4 is %d ", 4+4);
return 0;
  • Addition of 4 + 4 is 8

Comma Operator In scanf

Here is an example program where comma operator get used in scanf statement.

#include <stdio.h> //header file section
int main() //main section
int num;
printf("Enter a number : ");
printf("you entered %d",num);
return 0;
  • Enter a number: 2
  • you entered 2

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