C Operators/Expressions

Operators are used with operands to build expressions. For example the following is an expression containing two operands and one oprator.

	4 + 5

The following list of operators is probably not complete but does highlight the common operators and a few of the outrageous ones....

C contains the following operator groups.

• Arithmetic
• Assignment
• Logical/relational
• Bitwise
• Odds and ends!

• Operator precedence table.

The order (precedence) that operators are evaluated can be seen here.

Arithmetic

	+
	-
	/
	*
	%	modulo
	--	Decrement (post and pre)
	++	Increment (post and pre)

Assignment

These all perform an arithmetic operation on the lvalue and assign the result to the lvalue. So what does this mean in English? Here is an example:

	counter =index.html counter + 1; 

can be reduced to

	counter +=index.html 1; 		

Here is the full set.

	=index.html
	*=	Multiply
	/=index.html	Divide.
	%=index.html	Modulus.
	+=index.html	add.
	-=index.html	Subtract.
	<<=index.html HREF="assignment.html" left shift.
	>>=index.html	Right shift.
	&=index.html	Bitwise AND.
	^=index.html	bitwise exclusive OR (XOR).
	|=index.html	bitwise inclusive OR.

Logical/Relational

	==index.html 	Equal to
	!=	Not equal to
	>
	=
	<=index.html && HREF="logical.html" Logical AND
	|| 	Logical OR
	!  	Logical NOT

Bitwise

	&	AND (Binary operator)
	|	inclusive OR
	^	exclusive OR
	<< HREF="/~garyg/C_ref/C/CONCEPT/bit_shift.html" shift left
	>>	shift right
	~	one's complement

Odds and ends!

        sizeof() size of objects and data types.
	         strlen may also be of interest.
        &	Address of (Unary operator)
	*	pointer (Unary operator)
	?	Conditional expressions
	:	Conditional expressions
	,	Series operator.