编辑代码

//定义函数
//有参数，有返回值
func say(name:String) -> String{
    return "Nice to meet you! \(name)"
}

//调用函数
var str = say(name: "Lucy")
print(str)

//有参数，没有返回值
func sayHello(name:String){
    print("Hello,\(name)")
}
sayHello(name: "司马光")

//没有参数，没有返回值
func introduce(){
    print("I am a student")
}
introduce()

//没有参数，有返回值
func showMoney() -> Int{
    return 10000
}
print("I have $\(showMoney())")

var money:Int = showMoney()
print(money)

print(showMoney())