Objective-C language has the following operators.

Arithmetic Operators

Relational Operators

Logical Operators

Bitwise Operators

Assignment Operators

Misc Operators

The following table shows all the arithmetic operators in Objective-C.

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

+ | Adds two operands |

- | Subtracts second operand from the first |

* | Multiplies both operands |

/ | Divides numerator by denominator |

% | Modulus Operator and remainder of after an integer division |

++ | Increment operator increases integer value by one |

-- | Decrement operator decreases integer value by one |

The following table lists the relational operators supported by Objective-C.

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

== | Checks if the values of two operands are equal or not. |

!= | Checks if the values of two operands are not equal. |

> | Checks if the value of left operand is greater than the value of right operand. |

< | Checks if the value of left operand is less than the value of right operand. |

>= | Checks if the value of left operand is greater than or equal to the value of right operand. |

<= | Checks if the value of left operand is less than or equal to the value of right operand. |

The following table lists the logical operators supported by Objective-C language.

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

&& | Logical AND operator. If both the operands are non zero then condition becomes true. |

|| | Logical OR Operator. If any of the two operands is non zero then condition becomes true. |

! | Logical NOT Operator. Reverse the logical state of its operand. If a condition is true, then Logical NOT operator will make false. |

Bitwise operator works on bits and perform bit by bit operation.

The truth tables for &, |, and ^ are as follows:

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 |

The Bitwise operators supported by Objective-C language are listed in the following table.

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

& | Binary AND Operator copies a bit to the result if it exists in both operands. |

| | Binary OR Operator copies a bit if it exists in either operand. |

^ | Binary XOR Operator copies the bit if it is set in one operand but not both. |

~ | Binary Ones Complement Operator is unary and has the effect of 'flipping' bits. |

<< | Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand. |

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

There are following assignment operators supported by Objective-C language:

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

= | Assignment operator, Assigns values from right side operands to left side operand |

+= | Add AND assignment operator, It adds right operand to the left operand and assigns the result to left operand |

-= | Subtract AND assignment operator, It subtracts right operand from the left operand and assigns the result to left operand |

*= | Multiply AND assignment operator, It multiplies right operand with the left operand and assigns the result to left operand |

/= | Divide AND assignment operator, It divides left operand with the right operand and assigns the result to left operand |

%= | Modulus AND assignment operator, It takes modulus using two operands and assigns the result to left operand |

<<= | Left shift AND assignment operator |

>>= | Right shift AND assignment operator |

&= | Bitwise AND assignment operator |

^= | bitwise exclusive OR and assignment operator |

|= | bitwise inclusive OR and assignment operator |

sizeof() returns the size of an variable. sizeof(anInteger) will return 4.

`value = condition ? X:Y`

is called the Conditional Expression.

If Condition is true ? Then assign X to value, Otherwise assign Y to value.

Conditional operator `? :`

can be used to replace `if...else`

statements.
It has the following general form:

Exp1 ? Exp2 : Exp3;

Where Exp1, Exp2, and Exp3 are expressions. Notice the use and placement of the colon.

The value of a ? expression is determined like this: Exp1 is evaluated. If it is true, then Exp2 is evaluated and becomes the value of the entire ? expression. If Exp1 is false, then Exp3 is evaluated and its value becomes the value of the expression.

`&`

returns the address of an variable.
`&a;`

will give actual address of the variable.

`*`

is the Pointer operator to a variable.
`*a;`

will pointer to a variable.