Precedence Level

PRECEDENCE LEVEL:

- Till now we completed almost all the operators, so we know each and every operator’s functionality.

- But what if there are three or more operators in a single expression like 5*6+8-5/4

- If we indicate parenthesis the expression becomes

((5*6)+((8-5)/4))  then first 5*6=30 and next 8-5=3,
((30)+((3)/4))     then 3/4=0,
(30+0)             then 30+0=30
(30)               final result is 30.

- But what if we don't denote the parenthesis for 5*6+8-5/4, what result is obtained? How the expression is calculated?

- For such type of calculations C has certain rules to follow, each and every operation is calculated based upon the precedence level or the priority level of the operators.

- The precedence chart is shown below.

- The operator with highest priority according to precedence chart is calculated first.

- If an expression has operators with same precedence then they are calculated based on associativity.

 

Operator	Description	Associativity
( ) [ ] . -> ++ --	Parentheses Brackets dot operator to access members access members via pointer Postfix increment/decrement	left-to-right
++ -- + - ! ~ (type) * & sizeof	Prefix increment/decrement Unary plus/minus Logical negation/bitwise complement Type cast Dereference Address operator size of operator	right-to-left
*  /  %	Multiplication/division/modulus	left-to-right
+  -	Addition/subtraction	left-to-right
<<  >>	Left shift, Right shift operator	left-to-right
<  <= >  >=	Less than/Less than or equal to Greater than/greater than or equal to	left-to-right
==  !=	Equal to/ not equal to	left-to-right
&	Bitwise AND	left-to-right
^	Exclusive OR Operator	left-to-right
|	OR Operator	left-to-right
&&	Logical AND Operator	left-to-right
| |	Logical OR Operator	left-to-right
? :	Conditional Operator	right-to-left
= +=  -= *=  /= %=  &= ^=  |= <<=  >>=	Assignment Operator Addition/subtraction (Compound) Multiplication and division(Compound) Modulus and bitwise AND (Compound) Exclusive OR and inclusive OR (Compound) Left shift and right shift (Compound)	right-to-left
,	Comma operator	left-to-right