Objective-C Operators

Objective-C Operators , Objective-C also provides a set of so called logical operators designed to return boolean true and false. The OR (||) operator returns 1 if one of its two operands evaluates to true, otherwise it returns 0

sizeof Operator

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

Conditional Expression

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.

Address Operator

& returns the address of an variable. &a; will give actual address of the variable.

Pointer * operator

* is the Pointer operator to a variable. *a; will pointer to a variable.

Arithmetic Operators

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

Relational Operators

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.

Logical Operators

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 Operators

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.

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

Assignment Operators

=	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

Compound Assignment Operators

Operator	Description
x += y	Add x to y and place result in x
x -= y	Subtract y from x and place result in x
x *= y	Multiply x by y and place result in x
x /= y	Divide x by y and place result in x
x %= y	Perform Modulo on x and y and place result in x
x &= y	Assign to x the result of logical AND operation on x and y
x |= y	Assign to x the result of logical OR operation on x and y
x ^= y	Assign to x the result of logical Exclusive OR on x and y

Increment and Decrement Operators

x = x + 1; // Increase value of variable x by 1

x = x - 1; // Decrease value of variable x by 1	

x++; Increment x by 1

x--; Decrement x by 1

Comparison Operators

if (x == y)
      // Perform task

Boolean Logical Operators

bool flag = true; //variable is true
bool secondFlag;

secondFlag = !flag; // secondFlag set to false


if ((10 < 20) || (20 < 10))
        NSLog (@"Expression is true");


if ((10 < 20) && (20 < 10))
      NSLog (@"Expression is true");

The Ternary Operator

[condition] ? [true expression] : [false expression]

int x = 10;
int y = 20;

NSLog(@"Largest number is %i", x > y ? x : y );

Happy Coding 🙂