C Operators

C Operators are used to making mathematical or logical computations in the program.

These are of the following eight types - 


  1. Arithmetic Operator
  2. Relational Operator
  3. Logical Operator
  4. Assignment Operator
  5. Increment & Decrement Operator
  6. Conditional Operator
  7. Bitwise Operator
  8. Other Operator


Arithmetic Operators


With the help of these c operators, simple calculations like addition, subtraction, multiplication, and division, etc. can be done. These are of two types. Binary and Unary.


Binary Operators - Two operands or two numbers are required to use binary operators.


Operator Explanation
Addition (+) It is used to perform basic and simple addition.
Subtraction (-) It is used to perform basic and simple subtraction.
Multiply (*) It performs basic multiplication.
Division (/) It performs simple division.
Modulus (%) It returns the remainder.


Unary Operators - One operand or one number are required to use unary operators.


Operator Explanation
Plus (++) Increase value by 1
Minus (--) Decrease value by 1


Relational Operators


Sometimes we need to check the relation between two numbers. On the basis of this relationship, other calculations are based. For this, we use relational operators.

There are 6 types of 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


They are generally used with decision statements like if or loop statements like while etc.


Logical Operators


Logical operators are used to checking more than one condition. These are of three types -


Symbol Explanation
Logical AND (&&)

The logical operator && is used between two conditions when we have to check that both are true.

Logical OR (||)

Logical operator || is used between two conditions when we have to check whether one of the two is true or not.

NOT (!)

Logical operator ! is used for the opposite meaning.


Assignment Operators

It is used to assign a value to a variable or to store the remaining value in a variable after solving an expression.


Its general syntax is as follows –


Variable = expression/value


Operator Explanation
Assign (=) = j  The left operand gets set to the value of the expression on the right
Add then Assign (+=) += j or i = i + j
Subtract then Assign (-=) -= y or i = i – j
Multiply then Assign (*=) *= y or i = i * j
Divide then Assign (quotient) (/=) /= y or i = i / j
Divide then Assign (remainder) (%=) %= y or i = i % j


Increment/Decrement Operator


In 'C' programs, two important operators ++ and -- are used to add or subtract 1 respectively to the value of any variable.

Both of them come under the category of Unary Operators.


They are used in the following two ways.


Operator Explanation
x++ post increment
++x pre increment
x-- post decrement
--x pre decrement


Using the operator after in a variable means that the value is to be incremented after the statement is executed or using operator first means that the statement should be executed by doing increment first.


Conditional Operator


This c operator is used to check whether a condition is true or false and to make a decision based on the condition.

It is a ternary operator and requires three operands to be used.


Its general syntax is as follows –


Condition ? value1 : value2;


Bitwise Operators


It performs bit-level operations and requires two numbers or two operands to use.


Operator Meaning
& Bitwise AND
| Bitwise OR
^ Bitwise Exclusive OR
~ Bitwise Complement
<< Left Shift
>> Right Shift


Other Operators


The sizeof operator

The sizeof is a unary operator, returns the size of a variable.


Comma Operator

Will be discussed in later tutorials.