An
Operator is a symbol that tells the computer to perform certain mathematical or
logical manipulations. It is used to manipulate data and variables. They
usually form a part of the mathematical or logical expressions e.g., y=a + b.
here = and + are operators and y, a and b are operands.
Different
types of operators are given bellow:
1.
Arithmetic operator
C
provides all the basic arithmetic operators
Operators

Meaning

+

Addition or
unary plus (single operand)

−

Subtraction or
unary minus (single operand)

*

Multiplication

/

Division

%

Modulo
division

When
both the operands in a single arithmetic expression such as a + b are integers,
the expression is called an integer expression, and the operation is called
integer arithmetic.
If
a and b are integers, then for a = 14 and b = 4 we have the following results:
a
– b = 10, a + b = 18, a * b = 56, a / b = 3 (decimal part truncated / quotient)
and a % b = 2 (remainder of division)
2.
Relational operator
The
symbols used to compare two quantities are called relative operators. It
compare the operands and give its result is either true or false or one or
zero.
There
are six relational operators:
Operator

Meaning

<

Is less than.

<=

Is less than
or equal to.

>

Is greater
than.

>=

Is greater
than or equal to.

==

Is equal to.

!=

Is not equal
to.

For
example, 10 < 20 is true but 20 < 10 is false. Among the six relational
operators, each one is a complement of another operator.
>
is complement of <=
<
is complement of >=
== is
complement of !=
3.
Logical operator
There
are three logical operators, which are used to test more than one condition and
make decisions. E.g. a > b && x = = 10
C
has the following three logical operators
&& meaning logical AND
¦¦ meaning logical OR
!
meaning logical NOT
Like
the simple relational expression, a logical expression also yields a value of
one or zero. The logical expression given above is true only if a > b is
true and x == 10 is true. If either or both of them are false, the expression
is false.
4.
Assignment operator
Assignment
operators are used to assign the result of an expression to a variable. The
usual assignment operator is ‘=’.
5.
Increment and decrement operator
C
allows two very useful operators not generally found in other languages. These
are the ++ (increment) and −− (decrement)
operators.
The
operator ++ adds 1 to the operand, while −−
subtract 1. both are unary operators and taken the following form:
++a; or
a++;
−−a; or a−−;
6.
Bitwise operator
Bitwise
operators are used for manipulation of data at bit level. These operators are
used for testing the bits, or shifted them right or left. These may not be
applied to float or double.
Operator

Meaning

&

Bitwise AND

¦

Bitwise OR

^

Bitwise
exclusive OR

<<

Shift left

>>

Shift right

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