"Swift" Learning Notes (ii)--basic operators

Operators are the most used in programming, including unary, two, and ternary three operators. Swift is just as basic as other programming languages, and here's a summary of it, as well as its unique operators. For example interval operators

1, unary operators

= assignment operator, the most used, with no matter what the return value

+ addition (numbers added, can also be used for character stitching var ss = "A" + "B")

- Subtraction

* Multiplication

/ Division

% redundancy (minus sign ignored, floating point can also be redundant)

> greater than

< less than

2, two-dollar operator

+ + + self-increment (that is, i = i + i abbreviation, can be pre-++i, able to post i++, is the same, the predecessor: self-increment and return. Back: Back to self-increment)

--Self- subtraction (equals i = i-i)

+ = i + = A is a shorthand for i = i + A

- = Ibid.

= = equals

! = does not equal

>= greater than or equal to

<= less than or equal to

3, ternary operator (trinocular operator)

= = = Identical to infer whether two objects refer to the same instance of an object

!== not identical

?: question? The answer is true: The question is a false answer such as Var a=0;print ("\ (a>0?

1:2) ") Output 2

a...b Full closed interval contains a and b

A.. <b semi-closed interval contains a does not contain B

4, logical operator.   && | | Non-or (with and or the first condition satisfied will not calculate the second one.) This is a short-circuit calculation)

New operators:

1. The null-fit operator can be understood as a shorthand for the three-mesh operator

A??

B (A! = nil?)

A! : b), meaning that A is empty and return B is not NULL returns a.

"Swift" Learning Notes (ii)--basic operators