[Swift] Study Notes (2)-Basic Operators

Operators are the most commonly used in programming. They include one, two, and three operators. SWIFT is just as basic as other programming languages. The following is a summary of its unique operators, such as interval operators.

1. unary Operators

= Value assignment operator, which is the most used without any return values

+ Addition (Number Addition, can also be used for character concatenation var Ss = "A" + "B ")

-Subtraction

* Multiplication

/Division

% Perform remainder (the negative number is ignored, and the floating point number can also perform remainder)

> Greater

<Less

2. Binary Operators

++ Auto-increment (that is, the abbreviation of I = I + I, which can be frontend ++ I, or suffix I ++. The same is true. frontend time: auto-increment and then return, post: return and auto-increment)

-- Auto-subtraction (equal to I = I-I)

+ = I + = A is short for I = I +

-= Same as above

= Equal

! = Not equal

> = Greater than or equal

<= Less than or equal

3. Ternary Operators

=== Heng et determines whether two objects reference the same object instance

! = Non-Constant

? : Question? True Answer: false answer, for example, VAR a = 0; print ("\ (a> 0? ) ") Output 2

A... B full closed intervals include A and B

A. B semi-closed intervals include a, excluding B.

4. logical operators! & | Non-or (the second is not calculated if the sum or the first condition is met. This is short circuit calculation)