Comma and Sizeof() operator

                                       Comma and Sizeof() operator 

  
Comma Operator:-

Comma operator( , ) is to separate declaration of two variables ,two data types.It is also helpful in scanning and printing,In built in functions.I can explain you with this below example:-  

int a ,b ,c ,d;

//<datatype><var.>,<var>; 

float e;

//<datatype><var.>,<var>;

printf("%d",a);

scanf("%d",a);

Sizeof() :-
 this operator is used get size of variable.I can explain you with this below example:-  

int a,i;
i=size of (int a) ; //out will be 2 because integer use 2 bytes in memory

int =sizeof(datatype/variablr no.)

 

Operator	Description	Example
sizeof()	Returns the size of an variable.	sizeof(char  a), where a is interger, will return 1.
sizeof()	Returns the size of an variable.	sizeof(int  a), where a is interger, will return 2.
sizeof()	Returns the size of an variable.	sizeof(float a), where a is interger, will return 4.
sizeof()	Returns the size of an variable.	sizeof(double a), where a is interger, will return 8.