Kotlin _2

### 演算

fun main(args: Array<String>){
	// + - * / %
	val x = 10
    println(x / 3)
    println(x / 3.0)
    println(x % 3.0)
    
    var y = 5
    y++
    println(y)
    y--
    println(y)
    
    var z = 4
    z += 12
    
    // AND &&, or ||, Not !
    val flag = true
    println(!flag)
}

3
3.3333333333333335
1.0
6
5
false

### 文字列

fun main(args: Array<String>){
	// 文字列
	println("hello " + "world")
    
    val name = "yamada"
	println("my name is $name")
    println("my score is ${15 + 33}")
    
    // \n:改行　\t:タブ
    println("hello\n wor\tld")
}

hello world
my name is yamada
my score is 48
hello
wor ld

### ifの条件分岐

val score = 85
    if(score > 80){
        println("great!")
    } else if(score > 60){
        println("ok")
    } else {
        println("soso ..")
    }

> >= < <= == != 三項演算子 [code] val result = if(score> 80) “great” else “soso”
println(result)
[/code]

### when

// when
	val num = 3
    when(num) {
        0 -> println("Zero")
        1 -> println("One")
        2, 3 -> println("Two or Three")
        in 4..10 -> println("Many")
        else -> println("other")
    }

### while

var i = 0
    while (i < 10){
        println("loop: $i")
        i++
    }

do {
        println("loop2: $i")
        i++
    } while(i < 5)
&#91;/code&#93;

### for
&#91;code&#93;
for (i in 0..9){
        if(i == 5) break
        println(i)
    }

for (i in 0..9){
        if(i == 5) continue
        println(i)
    }
&#91;/code&#93;

### 関数
関数の引数は型を指定する
&#91;code&#93;
fun sayHi(name: String = "John", age: Int = 23){
    println("hi! $name($age)")
}

fun main(args: Array<String>){
	// for (変数)
    sayHi("tom", 22)
    sayHi()
}

値を返す時は、関数側で型を指定する

fun sayHi(): String{
    return "hi!"
}

fun main(args: Array<String>){
    val msg = sayHi()
    println(msg)
}

fun sayHi() = "hi!"

-> 配列で返す場合はどうするんだろう？？