Operators precedence and Associativity

Operators precedence and Associativity 

Operator precedence and associativity means which operators to perform at first. The table below lists the C operators and their precedence and associativity values. The highest precedence level is at the top of the table and as it goes down the associativity goes on decreasing. 

  

OPERATOR PRECEDENCE AND ASSOCIATIVITY 

Symbol	Name or Meaning	Associativity
++	Post-increment	Left to right
--	Post-decrement
( )	Function call
[ ]	Array element
->	Pointer to structure member
.	Structure or union member
++i	Pre-increment	Right to left
--i	Pre-decrement
!	Logical NOT
~	Bitwise NOT
-	Unary minus
+	Unary plus
&	Address
*	Indirection
sizeof	Size in bytes
new	Allocate program memory
delete	Deallocate program memory
(type)	Type cast [for example, (float) i]
.*	Pointer to a member (objects)	Left to right
->*	Pointer to a member (pointers)
*	Multiply	Left to right
/	Divide
%	Remainder
+	Add	Left to right
-	Subtract
<<	Left shift	Left to right
>>	Right shift
<	Less than	Left to right
<=	Less than or equal to
>	Greater than
>=	Greater than or equal to
==	Equal	Left to right
!=	Not equal
&	Bitwise AND	Left to right
^	Bitwise exclusive OR	Left to right
|	Bitwise OR	Left to right
&&	Logical AND	Left to right
||	Logical OR	Left to right
? :	Conditional	Right to left
=	Assignment	Right to left
*=, /=, %=, +=, -=, <<=, >>=, &=, ^=, |=	Compound assignment
,	Comma	Left to right

           Let's see the above operators in the program below:-  

#include <stdio.h>

void main()

{

    int a = 5;

    int b = 15;

    int c = 25;

    int d;

    d = (b + c) / a; // due to associativity first bracket operators will work at first.

    printf(" D is %d ", d);

}

    output  

    D is 8 

 

Another example  

#include <stdio.h>

void main()

{

    int a = 5;

    int b = 15;

    int c = 25;

    int d;

    d = b = c = a; // value of a will go to c, new value of c go b and new

 value of b go to d.

    /*  

    a = 5,  

    c = a(5) 

    b = c(5) 

    d = b(5) 

    */

    printf(" D is %d ", d);

}

    output  

     D is 5 

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