[TOC] ## 用枚舉提高復雜性 bad `if chosenColor=1` good `if chosenColor = Color_Red` 用于函數參數 bad `int result = RetrievePayRollData(data,true,false,false,true)` good ``` int result = RetrievePayrollData( data, EmploymentStatus_CurrentEmployee, PayRollType_salaried, SavingsPlan_NoDeduction, MedicalCoverage_IncludeDependents ) ``` ## 定義枚舉的第一項和最后一項,以便于循環邊界 ``` Public Enum Country Country_First= 0 Country_China= 0 Country_England= 1 Country_France= 2 Country_Germany a 3 Country_India= 4 Country_Japan=5 Country_Usa= 6 Country_Last = 6 End Enum ``` ## 把枚舉類型的第一個元素做非法值 把映射到0的那個元素聲明為無效會有助于捕捉那些沒有合理初始化的變量 ``` Public Enum Country Country_InvalidFirst= 0 Country_China= 0 Country_England= 1 Country_France= 2 Country_Germany a 3 Country_India= 4 Country_Japan=5 Country_Usa= 6 Country_Last = 6 End Enum ```