swift（二）swift字符串和字符和逻辑运算

/*
1.swift字符串和字符
2.构造字符串
3.字符串比较
4.数值运算
5.复制运算
6.关系运算
7.逻辑运算
8.区间运算

*/
/*
//数据 + 数据的处理
//字符信息+ 字符信息的处理
//char a = '张'
//“hello”
//const char * p = “hello”
//char array[]= "hello"

*/

//var c:Character
//c = "张"
//
//var b:String = "asdfa\0张/U0001f496"
//println(b)
//
//
//var d = "abcd张"
//println(count(d))


/*字符串构造
*/

//let str1 = "hello"
//let str2 = "word"
//let str = str1+str2
//
//var index = 9
//let  message = "http://www.mobiletrain.org"
//
//let urlhead = "\(message)/pic"
//
//println(urlhead)

/*
字符串比较
*/
let str = "hello"
if str > "aello"
{
    println(str)
}
let str1 = "apple"
if str1.hasSuffix("le")
{
    println(str1)
}

let str2 = "Apple"
println(str1.lowercaseString)

let str3 = "255"
let d = str3.toInt()!

println(d)



/*区间运算: (a...b)1...3->1,2,3

*/
for _ in 1...5{
    println("hello")
}

for i in 1...5{
    println(i)
}

for i in 1..<5{
    println(i)
}