NO.18 Swift 的類別和物件練習

1 定義兩個類別， 使用到繼承。
2 類別裡包含屬性和方法。
3 用類別生出多個物件。
4 讀取修改物件的屬性。
5 呼叫物件的方法。

import UIKit
class Family {
var name = "name"
var height = 0
var weight = 0
func data() {
print("名子: ", name, "身高: ", height, "體重： ", weight )
}
}
class Health: Family {
func bmi(name: String, height: Double, weight: Double) {
let number :Double = weight / pow((height / 100), 2)
print("名子: ", name, "身高: ", height, "體重： ", weight, "你的ＢＭＩ值: ", number )
}
}
var me = Family()
me.height = 180
me.name = "wangsc"
me.weight = 100
me.data()
let mother = Health().bmi(name: "ichlian", height: 160.0, weight: 50.0)
let me2 = Health().bmi(name: "wangsc", height: 180.0, weight: 100.0)