#2 Opertaor in C

➤Assignment operator  :-

This operator is used to assign the value in variable .

Example:-

A=10

B=10.5

Name=”COc”

➤Multiple assignment operator :-

This operator is used to assign same value in multiple variables.

Example:-

a = b = c = 10;

➤Compund assignment  :-

• Assignment  operator is used with arithmetic operator  and bitswise operator. This concept is called compound assignment operator.
• It is also known as shortcut assignment operator.

Example:-

a = a+10   can be written as  a+=10

a = a *30 can be written as  a*=30

➤Increment operartor (++)  :-

This operator is used to increase the value of variable by 1.

⏩Prefix increment :-

• Increment operator is used before operand. Eg:- ++a
• Value of variable is incremented first,then new value is used in operation .

⏩Postfix increment :-

• Increment operator is used after operand. Eg:- a++
• Value of variable is used in the operation first, then incremented

Evaluation of prefix and and postfix :

Prefix	Postfix
1.       a=10, b=20 ++a    a=11 ++b    b=21 a=11 b=21 2.       a=10, b=20 p=++a    a=11 q=++b    b=21 a=11 b=21 p=11 q=21 3.       a=10, b=20 ++a    a=11 ++b    b=21 p=++a   a=12 q=++b   b=22 a=12 b=22 p=12 q=22	1.       a=10, b=20 a++   a=10 b++   b=20 a=11 b=21 2.       a=10, b=20 p=a++   a=10 q=b++   b=20 a=11 b=21 p=10 q=20 3.       a=10, b=20 a++    a=10 b++    b=20 p=a++    a=11 q=b++    b=21 a=12 b=22 p=11 q=21

➤Decrement operator :-

This operator is used to decrease the value of variable by 1.

⏩Prefix decrement :-

• Decrement operator is used before operand. Eg:-  --a
• Value of variable is decremented first,then new value is used in operation .

⏩Postfix decrement :-

• Decrement operator is used after operand. Eg:-   a--
• Value of variable is used in the operation first, then decremented.

➤Comma operator :-

• This operator is used to separate multiple values within parenthesis sign “( )”.
• In this case last value will be evaluated and assigned in variable.

Case1:-

             a=(10,20,30,40);

      a=40

Case2:- 

               a=10,20,30,40;

       a=10

➤Sizeof operator :-

This operator return the size of data type and variable in byte.

Syntax:-

              sizeof(data type variable)

example:-

·         sizeof(int)    2byte  

·         sizeof(float)   4byte

·         int a; sizeof(a);  2byte

·         sizeof(‘A’)   1byte

·         sizeof(“coc”)   4byte

Operator in C

Operator is a special symbol which is used to perform particular operation on operands.

example:- a+b-c   
              here: +,- are operators and a,b,c are operands.

There are some operators in C :-

1. Arithmetic operator
2. Relational operator
3. Logical operator
4. Assignment operator
5. Multiple assignment operator
6. Compound assignment operator/shortcut assignment
7. Increment
8. Decrement
9. Comma operator
10. Sizeof operator
11. Bitwise operator
12. Unary operator
13. Binary operator
14. Ternary operator/conditional

➤Arithmetic operator :-

This operator is used to perform arithmetic operation as addition, subtraction, multiplication,etc.

Operator	Meaning
+	Addition
-	Subtraction
*	Multiplication
/	Division
%	Remainder / Modulo division

example:-

10 / 4=2

10.0 / 4=2.5

10 / 4.0=2.5

10 % 4=2

4 % 10=4

-10 % 4=-2

10 % -4=2

-10 % -4=-2

-30.45 % 2.45= error

Note:1 If the value of operand is less than the value of second operand then remainder must be the value of first operand.

Note:2 The sign of remainder depends on only the sign of first operand.

Note:3 Real type operands cannot be allowed with modulo division.

➤ Relational operator :-

 This type of operator is used to compare between two numbers.

It returns Boolean value as zero(false) or one(true).

Operator	Meaning
<	Less than
>	Greater than
<=	Less than or equal to
>=	Greater than or equal to
!=	Not equal to
==	Equal to

example:-

20>=20 ➔ 1

30 > 40 ➔ 0

4 != 5   ➔ 1

4 == 6 ➔ 0

30 < 40 ➔ 1

➤ Logical operator :-

This operator is used to combine more than one condition.

It also returns Boolean value.

Operator	Meaning
&&	Logical AND
||	Logical OR
!	Logical NOT

⏩Logical AND(&&) :-

It returns true if all combined condition are true otherwise returns false.

example:-

1. 20 >= 20 && 30 > 50 && 4 != 6 ➔ false(0)
2. 4 != 6 && 4>3 && 4 == 4 ➔ true(1)

⏩Logical OR(||) :-

It returns true if any combined condition is true otherwise returns false.

example:-

1. 20 >= 20 || 30 > 50 || 4 != 6 ➔ true(1)
2. 40 != 40 || 40 > 50 ➔ false(0)

⏩Logical NOT(!) :-

It returns true if condition is false otherwise returns false.

example:-

1. !(40 >50) ➔ true
2. !(30 > 50 && 4 != 6) ➔ true
3. !(40 != 60 || 30 > 60) ➔ false