不起作用的其他方法
本文关键字:方法 其他 不起作用 | 更新日期: 2023-09-27 18:27:48
我意识到我可以将数据放在构造函数正在调用的方法中,并且它可以工作。然而,我只是打乱了一些代码,我正在尝试使用其他方法进行计算。这是一本书中的问题,由于我有几个星期没有导师可以窃听,我想我会在这里问。
有什么意见吗?请并感谢
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication305
{
class Program
{
static void Main(string[] args)
{
Trip a = new Trip();
Console.WriteLine(a);
}
class Trip
{
int distanceTraveled;
double costGas;
int numberGallon;
int mpg;
double cpm;
public int DistanceTraveled
{
get
{
return distanceTraveled;
}
}
public double CostGas
{
get
{
return costGas;
}
}
public int NumberGallon
{
get
{
return numberGallon;
}
}
public Trip()
{
distanceTraveled = 312;
costGas = 3.46;
numberGallon = 10;
}
public void milesPerGal()
{
mpg = distanceTraveled / numberGallon;
}
public void costPerMile()
{
cpm = costGas * mpg;
}
public override string ToString()
{
return String.Format("The distance traveled is...{0} 'nThe cost per gallon of gasoline is... {1} 'nThe amount of gallons were... {2} 'nThe miles per gallon attained were... {3} 'nThe cost per MPG were... {4}", distanceTraveled, costGas, numberGallon, mpg, cpm);
}
}
}
}
如果我正确理解你的问题,这应该对你有效:
class Trip
{
int distanceTraveled;
double costGas;
int numberGallon;
int mpg;
double cpm;
public int DistanceTraveled
{
get
{
return distanceTraveled;
}
}
public double CostGas
{
get
{
return costGas;
}
}
public int NumberGallon
{
get
{
return numberGallon;
}
}
public Trip()
{
distanceTraveled = 312;
costGas = 3.46;
numberGallon = 10;
mpg = milesPerGal();
cpm = costPerMile();
}
public int milesPerGal()
{
return distanceTraveled / numberGallon;
}
public double costPerMile()
{
return costGas * mpg;
}
public override string ToString()
{
return String.Format("The distance traveled is...{0} 'nThe cost per gallon of gasoline is... {1} 'nThe amount of gallons were... {2} 'nThe miles per gallon attained were... {3} 'nThe cost per MPG were... {4}", distanceTraveled, costGas, numberGallon, mpg, cpm);
}
}
老实说,这里一切都很好。由于您从未调用方法milesPerGal或costPerMile,所以私有变量mpg和cpm的值仍然为0,也将输出。
你可能想要的是这个构造函数:
public Trip()
{
distanceTraveled = 312;
costGas = 3.46;
numberGallon = 10;
milesPerGal();
costPerMile();
}
为了使此代码如您所期望的那样工作,我建议您使用适当的getter和setter,如下所示:
class Trip
{
public int DistanceTraveled { get; set; }
public double CostGas { get; set; }
public int NumberGallon { get; set; }
public int MilesPerGallon { get { return (NumberGallon != 0) ? DistanceTraveled / NumberGallon : 0; } }
public double CostPerMile { get { return CostGas * MilesPerGallon; } }
public Trip()
{
DistanceTraveled = 312;
CostGas = 3.46;
NumberGallon = 10;
}
public override string ToString()
{
return String.Format("The distance traveled is...{0} 'nThe cost per gallon of gasoline is... {1} 'nThe amount of gallons were... {2} 'nThe miles per gallon attained were... {3} 'nThe cost per MPG were... {4}", DistanceTraveled, CostGas, NumberGallon, MilesPerGallon, CostPerMile);
}
}
请注意,使用这种方法,无论何时更新具有setter的任何字段(DistanceTraveled
、CostGas
和NumberGallons
),相应的派生值(MilesPerGallon
和CostPerMile
)都将自动更正,而无需任何额外的方法调用,因为当有人访问这些字段时,它们是动态计算的。