Chapter 11 : Swift Operators
Operator are used for mathematical and logical manipulation with variables.
We have below operators that supports ObjectiveC included with swift support
 Arithmetic
 Assignment
 Bitwise
 Comparison
 Logical
 Misc
 Range
Arithmetic Operator
If A = 10 , B = 11
+ Adds two operands A + B will give 21
− Subtracts second operand from the first A − B will give 1
* Multiplies both operands A * B will give 110
/ Divides numerator by denominator B / A will give 1
% Modulus Operator and remainder of after an integer/float division B % A will give 1
Assignment Operator
= Simple assignment operator, Assigns values from right side operands to left side operand
C = A + B will assign value of A + B into C
+= Add AND assignment operator, It adds right operand to the left operand and assigns the result to left operand
C += A is equivalent to C = C + A
= Subtract AND assignment operator, It subtracts right operand from the left operand and assigns the result to left operand
C = A is equivalent to C = C
*= Multiply AND assignment operator, It multiplies right operand with the left operand and assigns the result to left operand
C *= A is equivalent to C = C * A
/= Divide AND assignment operator, It divides left operand with the right operand and assigns the result to left operand
C /= A is equivalent to C = C / A
%= Modulus AND assignment operator, It takes modulus using two operands and assigns the result to left operand
C %= A is equivalent to C = C % A
<<= Left shift AND assignment operator
C <<= 2 is same as C = C << 2
>>= Right shift AND assignment operator
C >>= 2 is same as C = C >> 2
&= Bitwise AND assignment operator
C &= 2 is same as C = C & 2
^= bitwise exclusive OR and assignment operator
C ^= 2 is same as C = C ^ 2
= bitwise inclusive OR and assignment operator
C = 2 is same as C = C  2
Bitwise Operators
Bitwise operators supported by Swift 4 language are listed in the following table. Assume variable A holds 60 and variable B holds 13, then 7−
&
Binary AND Operator copies a bit to the result, if it exists in both operands.
(A & B) will give 12, which is 0000 1100

Binary OR Operator copies a bit, if it exists in either operand.
(A  B) will give 61, which is 0011 1101
^
Binary XOR Operator copies the bit, if it is set in one operand but not both.
(A ^ B) will give 49, which is 0011 0001
~
Binary Ones Complement Operator is unary and has the effect of ‘flipping’ bits.
(~A ) will give 61, which is 1100 0011 in 2’s complement form.
<<
Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand.
(A << 2 will give 240, which is 1111 0000
>>
Binary Right Shift Operator. The left operands value is moved right by the number of bits specified by the right operand.
A >> 2 will give 15, which is 0000 1111
p 
q 
p&q 
pq 
p^q 
0 
0 
0 
0 
0 
0 
1 
0 
1 
1 
1 
1 
1 
1 
0 
1 
0 
0 
1 
1 
Comparison Operators
variable A holds 10 and variable B holds 20, then −
==
Checks if the values of two operands are equal or not; if yes, then the condition becomes true.
(A == B) is not true.
!=
Checks if the values of two operands are equal or not; if values are not equal, then the condition becomes true.
(A != B) is true.
>
Checks if the value of left operand is greater than the value of right operand; if yes, then the condition becomes true.
(A > B) is not true.
<
Checks if the value of left operand is less than the value of right operand; if yes, then the condition becomes true.
(A < B) is true.
>=
Checks if the value of left operand is greater than or equal to the value of right operand; if yes, then the condition becomes true.
(A >= B) is not true.
<=
Checks if the value of left operand is less than or equal to the value of right operand; if yes, then the condition becomes true.
(A <= B) is true.
Logical Operators
variable A holds 1 and variable B holds 0, then
&&
Called Logical AND operator. If both the operands are nonzero, then the condition becomes true.
(A && B) is false.

Called Logical OR Operator. If any of the two operands is nonzero, then the condition becomes true.
(A  B) is true.
!
Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true, then the Logical NOT operator will make it false.
!(A && B) is true.
Misc Operators
Unary Minus
The sign of a numeric value can be toggled using a prefixed –
3 or 4
Unary Plus
Returns the value it operates on, without any change.
+6 gives 6
Ternary Conditional
Condition ? X : Y
If Condition is true ? Then value X : Otherwise value Y
Range Operators
Closed Range
(a…b) defines a range that runs from a to b, and includes the values a and b.
1…5 gives 1, 2, 3, 4 and 5
HalfOpen Range
(a..< b) defines a range that runs from a to b, but does not include b.
1..< 5 gives 1, 2, 3, and 4
One sided Range
a… , defines a range that runs from a to end of elements
…a , defines a range starting from start to a
1… gives 1 , 2,3… end of elements