swift--Type Conversion Basics

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The links are as follows.

? http://edu.51cto.com/roadmap/view/id-58.html

1 varStrvalue:string ="12345"2 varIntValue1 = Strvalue.toint ()//to int method so that you can directly convert the3 println (intValue1);4 varIntvalue2:int? = Strvalue.toint ()//An error occurs without a question mark, which turns the intValue2 into an optional state. 5 println (intValue2);6 7 varStrvalue1:string ="AB12"8IntValue1 =Strvalue1.toint ()9println (intValue1);

If it contains non-numeric characters, it returns nil. This is the function of the question mark. Or do not add: int, the system automatically recognizes the type.

1 var strvalue2:string = toString (intValue1);

2 var strvalue3:string = toString (true)

3 println (STRVALUE3) //output is true

swift--Type Conversion Basics