C Foundation

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

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

Operators

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

Looping

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

Functions

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

Scope

Scope C Local Scope C Global Scope

Storage Classes

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

Array

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

String

What is String C String Functions

Pointer

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

Structure

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

Union

What is Union

Files

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

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

C Reference

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

Note:

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.

commaprintf.c
#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.

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

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