Day11 swift2.0-String

//                                      **Day 11

//                                      **swift 2.0  String

var arr = [1,"2",3.3]

print("\(arr)")

var dict = ["a":1,"b":2,"c":3]

(dict as NSDictionary).allKeys

(dict as NSDictionary).allValues

var string = "hello world!"

let range = string.startIndex..<string.startIndex.advancedBy(5)

string.replaceRange(range, with: "Hi")

string

print("\(string)")

let range2 = string.endIndex.advancedBy(-6)..<string.endIndex

string.substringWithRange(range2)

var animals = "\u{1F60E}hoho~"

animals.characters.count

var swift_string = "symbol2.0"

let string2 = swift_string + "ahaha~"

print("\(string2)")

swift_string

swift_string.appendContentsOf("addString")

print("\(swift_string)")

var i = 1

for  ; i <= 100 ;  {

i*i

i += 1

}

for var a = -6.28 ; a <= 6.28 ; a += 0.2 {

sin(a)

cos(a)

tan(a)

1/tan(a)

}

var newstring = "hello world!"

for var c in newstring.characters {

print("\(c)")

if c == "r" {

c = " "

print("\(newstring.endIndex)")

}

print("\(c)")

}

print("\(newstring)")