Chapter 11 : Swift Operators



Operator are used for mathematical and logical manipulation with variables.

We have below operators that supports Objective-C 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

p|q

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 non-zero, then the condition becomes true.

(A && B) is false.

 

||

Called Logical OR Operator. If any of the two operands is non-zero, 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

 

Half-Open 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



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