//: Playground - noun: a place where people can play

import Cocoa

var str = "Hello, playground"
var num1 = 13;
var num2 = 50;
num2 - num1;

// 常量
let const = 100

print("AX")

//  循环控制，以及数据变化
for i in 0...100
{
    
    (num2 - num1)
    sin(Double (3 * i))
}
