//-----------------------------------------------------------
//常量
let age = 25 * 4
//变量
var name = "zhangsan"
name = "张三" + "hhh"
print("姓名：\(name),年龄:\(age)")
//定义多个常量
let number = "123456", score = 70, address = "徐汇区零陵路"
//定义多个变量
var height = 168, sex = "男", weight = 55
height = 166
weight = 54
print("姓名:\(name),性别:\(sex),年龄:\(age),身高:\(height),体重:\(weight)KG,学号：\(number),成绩:\(score),地址:\(address)")
//类型标注------------------------------------------------------
//常量类型标注
let name2 : String = "李四"
//变量类型标注
var name3 : String = ""
name3 = "李小四"
print("常量标注==\(name2),变量标注==\(name3)")
//32位整数范围
print("\(UInt32.min)<32位整数范围<\(UInt32.max)")
//8位整数范围
print("\(UInt8.min)<32位整数范围<\(UInt8.max)")
//类型别名--------------------------------------------------------
typealias ZhangSan = String
var name4 : ZhangSan = "张三"
var tempName = name4 + "李四"
print("name4==\(name4),tempName==\(tempName)")
