Kotlin Foundation 2

Package android.zhh.com Import android.app.Activity import android.os.Bundle import android.util.Log Import Java.math.BigInteger class Main2activity:activity () {Override fun OnCreate (Savedinstancestate:bundle?) {super.oncreate (savedinstancestate) Setcontentview (r.layout.activity_main2)/** * Function General
        notation *///line1;
        /** * When the content of the LINE1 function is only one line, the function above can be written in this way *///line2 (on);
        /** * When the content of the LINE1 function is only one row, it can also be written as a function expression *///Line3 (for each);
         /** * default parameter and named parameter * Default parameter val PII = 3;
         * Named parameter Canshu (a2=3);
        *///Canshu (a2=3);
        /** * Exception Handling *///Testtry ();

    /** * Function Recursive call * self-drop yourself */Testdigui (10);
    }/** * General wording of the function * */fun line1 (a1:int,a2:int): int{return a1+a2; }/** * When the content of the LINE1 function is only one line, the function above can be written this way */Fun line2 (A1:int,a2:int): INT=A1+A2;
    /** * When the content of the LINE1 function is only one row, it can also be written as a function expression */var line3 ={a1:int,a2:int->a1+a2;
     }/** * default parameter and named parameter * Default parameter val PII = 3;
     * Named parameter Canshu (a2=3);
    */Val PII = 3;
       Fun Canshu (Pi:int = pii,a2:int) {var a3 = pi+a2;
    LOG.E ("111", "a3>>>" +a3);
         }/** * Character A and number conversion */Fun Testnum () {//If the string is something like "a", the type conversion exception var a1= "5";
var a2=5;
Convert a string to a group var A11 = A1.toint ();
    Converts a number to a string var a22=a2.tostring ();
        }/** * Data entered from the keyboard, operation * This is to be entered with the keyboard, do not test here */Fun TestKey () {LOG.E ("111", "first input data");
        var num1=readline ();//return value allowed is null LOG.E ("111", "first input data");
var num2=readline (); //      !! Indicates that the data passed in must not be empty var num11=num1!!.
        ToInt (); var num22=num2!!.
        ToInt ();
    LOG.E ("111", "${NUM11+NUM22}"); }/** * Exception handling * * Fun testtry () {try {var a1:int = 0;
            var a2:int = 1;
        var a3=a2/a1;
        }catch (e:exception) {LOG.E ("111", "program exception" +e.message);  }}/** * Recursive call to function * self-drop yourself */fun Testdigui (num:int): int{if (num==1) {return
        Num
    } return Num*testdigui (num-1);
 }




}

Reference Video:

Http://yun.itheima.com/course/266.html?1708ku-hda6

SOURCE Download:

http://download.csdn.net/download/zhaihaohao1/10178134

Reference Document: http://www.kotlindoc.cn