import Foundation
println("Hello, World!");
var v1 = 1;
var v2 = 2;
println(" v1 is \(v1) v2 is \(v2)");
var v3 = v1 + v2;
println("v3 is \(v3)");
//字符转换
var v4 : Double = Double(v3) + 3.14;
println("v4 is \(v4)");
var v5 = "hello"
let v6 = "world"
println(v5 + " " + v6);
//声明仅仅读类型变量
let v7 = 3.1415;
println("v7 is " + String(v7));
var arr = [1,2,4,6];
println("arr index 1 is \(arr[1])");
//声明字典
var airports: Dictionary
var v8 = "10";
//字符串是否为空
if v8.isEmpty{
println("v8 is true");
}
//遍历字符串
for character in "ddd1ew?"{
println("char is " + character)
}
//字符串长度计算
let unusualMenagerie = "Koala ??
??, Snail ????, Penguin ?
???
, Dromedary ??
?
?
"
println("unusualMenagerie has \(countElements(unusualMenagerie)) characters")
var var9 = countElements(unusualMenagerie)
println("var9 lenght is \(var9)")
//比較字符串
let quotation = "We're a lot alike, you and I."
let sameQuotation = "We're a lot alike, you and I."
if quotation == sameQuotation {
println("These two strings are considered equal")
}
//大写和小写转换
let normal = "Could you help me, please?"
let shouty = normal.uppercaseString
// shouty 值为 "COULD YOU HELP ME, PLEASE?
"
let whispered = normal.lowercaseString
// whispered 值为 "could you help me, please?"
//String 转换 int
var i :Int = "1".toInt()!
println("\(i)")
手机扫一扫
移动阅读更方便
你可能感兴趣的文章