Erlang - Operators

An operator is a symbol that tells the compiler to perform specific mathematical or logical manipulations.
Erlang has the following type of operators −

• Arithmetic operators
• Relational operators
• Logical operators
• Bitwise operators

Arithmetic Operators

Erlang language supports the normal Arithmetic operators as any the language. Following are the Arithmetic operators available in Erlang.
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Operator	Description	Example
+	Addition of two operands	1 + 2 will give 3
−	Subtracts second operand from the first	1 - 2 will give -1
*	Multiplication of both operands	2 * 2 will give 4
/	Division of numerator by denominator	2 / 2 will give 1
rem	Remainder of dividing the first number by the second	3 rem 2 will give 1
div	The div component will perform the division and return the integer component.	3 div 2 will give 1

Relational Operators

The Relational Operators allow the comparison of objects. Following are the relational operators available in Erlang.
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Operator	Description	Example
==	Tests the equality between two objects	2 = 2 will give true
/=	Tests the difference between two objects	3 /= 2 will give true
<	Checks to see if the left object is less than the right operand.	2 < 3 will give true
=<	Checks to see if the left object is less than or equal to the right operand.	2 =<3 will give true
>	Checks to see if the left object is greater than the right operand.	3 > 2 will give true
>=	Checks to see if the left object is greater than or equal to the right operand.	3 >= 2 will give true

Logical Operators

These Logical Operators are used to evaluate Boolean expressions. Following are the logical operators available in Erlang.
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Operator	Description	Example
or	This is the logical “and” operator	true or true will give true
and	This is the logical “or” operator	True and false will give false
not	This is the logical “not” operator	not false will give true
xor	This is the logical exclusive “xor” operator	True xor false will give false

Bitwise Operators

Erlang provides four bitwise operators. Following are the bitwise operators available in Erlang.
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S.No.	Operator & Description
1	band This is the bitwise “and” operator
2	bor This is the bitwise “or” operator
3	bxor This is the bitwise “xor” or Exclusive or operator
4	bnot This is the bitwise negation operator

Following is the truth table showcasing these operators −

p	q	p & q	p | q	p ^ q
0	0	0	0	0
0	1	0	1	1
1	1	1	1	0
1	0	0	1	1

Operator Precedence

The following table shows the Operator Precedence for the Erlang operators in order of descending priority together with their associativity. Operator precedence and associativity are used to determine the evaluation order in un-parenthesized expressions.

Operators	Associativity
:
#
bnot,not
/,*,div,rem,band,and	Left associative
+,-,bor,bxor,or,xor	Left associative
==,/=,=<,<,>=,>