//字符串和字符

//1.定义

let str2 = "hellow"

let str3 = "hellow world"

let str4 = "w"

let str5 = "y"//单个字符，多个或没有会报错

//2.字符串比较==

if str2 == str3{

println("\(str2)与\(str3)是相等的")

}else{

println("\(str2)与\(str3)是不相等的")

}

//3.判断后缀是否相等

if str2.hasSuffix(str4){

println("\(str2)的后缀是\(str4)")

}

//4.判断前缀是否相等

if str3.hasPrefix(str2){

println("\(str3)的前缀是\(str2)")

}