Operators are special symbols that do some predefined task on the operands.

They are used to performing operations like arithmetic, logical, etc.

There are following three types of operators in C language.

- Unary Operators
- Binary Operators
- Ternary Operators

## Unary Operators

Unary Operators are the operators which require single operand to perform any action.

**Examples of unary operator**

**sizeof:**return the size of an operand in bytes.

Example:

123int i, j;i = sizeof(int); //return 4 bytesj = sizeof(i); //return 4 bytes**increment operator (++):**This operator adds 1 to its operand.

Example

12int num = 10;num++; //output: 11 (which is equivalent to num = num + 1)

increment operator is divided into two types**post-increment operator –**

12345678int a = 10;printf("a=%d",a++);printf("a=%d",a);/*output:a = 10;a = 11;*/

In this statement first the value of ‘a’ will be printed on screen and then the value of ‘a’ incremented by 1.**pre-increment operator –**

12345678int a = 10;printf("a=%d",++a);printf("a=%d",a);/*output:a = 11;a = 11;*/

In this statement first the value of ‘a’ will be incremented by 1 and then the incremented value will be printed on screen.

**decrement operator (–):**This operator subtracts 1 from its operand.

Example:

123int num = 10;num--; //output: 9//which is equivalent to num = num - 1;

decrement operator is divided into two types**post-decrement operator –**

12345678int a = 10;printf("a=%d",a--);printf("a=%d",a);/*output:a = 10;a = 9;*/

In this statement first the value of ‘a’ will be printed to screen and then the value of ‘a’ decremented by 1.**pre-decrement operator –**

12345678int a = 10;printf("a=%d",--a);printf("a=%d",a);/*output:a = 9;a = 9;*/

In this statement first the value of ‘a’ will be decremented by 1 and then the decremented value will be printed on the screen.

**unary minus operator:**unary minus negate the value.

Example:

12int a = 10;int b = -(a); //output: b = -10

### Binary Operators

Binary operators are the operators which require two operands to perform any action.

C offers different types of binary operators. they are given as follows

- Arithmetic Operators
- Logical Operators
- Relational Operators
- Bitwise Operators
- Assignment Operators
- Special Operators

### Arithmetic Operators

These operators are used to perform arithmetic/mathematical operations.

Below table describes all arithmetic operators.

Assume a = 20 and b = 10.

Operator | Name | Description | Example |
---|---|---|---|

+ | Addition | Adds two operands | a + b = 30 |

– | Subtraction | Subtracts two operands | a – b = 10 |

* | Multiplication | Multiplies two operands | a * b = 200 |

/ | Division | Divides first operand by second | a / b = 2 |

% | Modulus | Returns the remainder of division | a % b = 0 |

### Relational Operators

Relational operators are used to compare two values.

The output of relational operators is boolean values i.e. true or false.

Following table describes all relational operators supported by C language

(assume a=5 and b=6)

Operator | Name | Description | Example | Output |
---|---|---|---|---|

= = | Is equal to | Checks whether the two operands are equal or not. If so, it returns true. Otherwise, it returns false. | a = = b | false |

!= | Is not equal to | Checks whether the two operands are equal or not. If so, it returns true. Otherwise, it returns false. | a ! = b | true |

> | Greater than | Checks whether the first operand is greater than the second operand. If so, it returns true. Otherwise it returns false | a > b | false |

< | Less than | Checks whether the first operand is lesser than the second operand. If so, it returns true. Otherwise, it returns false. | a < b | true |

>= | Greater than or equal to | Checks whether the first operand is greater than or equal to the second operand. If so, it returns true. Otherwise, it returns false. | a > = b | false |

< = | Less than or equal to | Checks whether the first operand is lesser than or equal to the second operand. If so, it returns true. Otherwise, it returns false. | a < = b | true |

### Logical Operators

This operator is used to test more than one condition.

C supports 3 logical operators.

Following table describes all logical operators with example

(assume x = 5 and y = 10)

Operator | Name | Description | Example | Output |
---|---|---|---|---|

&& | logical AND | It returns true when both conditions are true | (x>5)&&(y<5) | false |

|| | logical OR | It returns true when at-least one of the condition is true | (x>=5)||(y>=10) | true |

! | logical NOT | It is used to reverse state of its operand. If a condition is true, then Logical NOT operator will make it false. | !((x>5)&&(y<5)) | true |

### Bitwise Operators

In C, there are 6 bitwise operators.

Consider a = 10 and b = 2 then their binary conversion is

a = 1010

b = 0010

Following is the list of bitwise operators.

Operator | Name | Description | Example | Output |
---|---|---|---|---|

& | Bitwise AND | The result of a&b is 1 only if both bits are 1. | a & b (1010 & 0010) | 2 |

| | Bitwise OR | The result of OR is 1 any of the two bits is 1 | a | b | 10 |

^ | Bitwise XOR | The result of XOR is 1 if the two bits are different. | a ^ b | 8 |

>> | Binary Right Shift | The left operands value is moved right by the number of bits specified by the right operand. | a >> 2 | 2 |

<< | Binary Left Shift | The left operands value is moved left by the number of bits specified by left operand | a << 2 | 40 |

~ | Binary One’s Complement | Inverts all bits. | ~ a | 5 |

### Assignment Operators

It is the value assigning operator. After evaluating the expression on the right-hand side, it assigns the value to the variable on the left-hand side.

Following is list of assignment operators (let A = 10)

Operator | Name | Example | |
---|---|---|---|

= | Assignment operator | marks = 10 | |

+= | Increment, then assign | A += 2 (i.e. A = A + 2) | A = 12 |

– = | Decrement, then assign | A -= 2 (i.e. A = A – 2) | A = 8 |

* = | Multiply, then assign | A *= 2 (i.e. A = A * 2) | A = 20 |

/= | Divide, then assign | A /= 2 (i.e. A = A / 2) | A = 5 |

%= | Modulus, then assigns | A %= 2 (i.e. A = A % 2) | A = 0 |

<<= | Left shift and assigns | A <<= 2 (i.e. A = A << 2) | 40 |

>>= | Right shift and assigns | A >>= 2 (i.e. A = A >> 2) | 2 |

&= | Bitwise AND assigns | A &= 2 (i.e. A = A & 2) | 2 |

^= | Bitwise exclusive OR and assigns | A ^= 2 (i.e. A = A ^ 2) | 8 |

|= | Bitwise inclusive OR and assigns | A |= 2 (i.e. A = A | 2) | 10 |

### Special Operators

There are two special operators in C language given in following table

Operator | Description | Example |
---|---|---|

& | It returns the address of a variable | &a |

* | It is used as pointer to a variable | *a |

## Ternary or conditional Operator ( ? : )

- There is one ternary operator supported by C language
- The ternary operator is also called as “Conditional Operator”.
**Syntax:**Condition ? expression1 : expression2

If condition is true expression1 gets executed else expression2.- A ternary operator is a short form of if-else.

**Example:**

1 2 3 4 5 6 7 8 |
int a = 10; printf("%d\n",(a == 1)? 20 :30); printf("%d",(a == 10)? 20 :30); /* Output: 30 20 */ |

- Ternary operator can be nested as following:

Condition ? expression1(condition1 ? exp 1 :exp 2) : expression2 (condition2 ? exp 1 :exp 2) - For example:

int big, a, b, c ;

big = ( a > b ? ( a > c ? 3: 4 ) : ( b > c ? 6: 8 ) ) ;

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