今天一个同事问了我个问题，问我要实现一个计算器的方式有多少种？突然感到有种想笑的冲动，何故问这样的问题呢？他说C#是种非常美妙的语言，设计的又非常完美，我想知道这样的语言那把这个简单的问题如何的实现！我大致想了想也确实如此。在此想和大家分享一下计算器的实现心得！
要实现这样一个功能实在是太容易了，就看你怎样的想去实现它了，本人分析了以下八种供大家参考：
001.计算器的面向过程版本？
002.计算器的面向对象版本？
003.计算器的工厂模式版本？
004.计算器的多态抽象方法版本？
005.计算器的多态实现版本？
006.计算器的接口工厂模式版本？
007.计算器的抽象工厂模式版本？
008.计算器的多态接口版本？
首先看在什么样的情况下，再根据不同的方法去实现！
001.计算器的面向过程版本！
static string opter;
static void Main(string[] args)
{
double num1 = InputHelper();
double num2 = InputHelper();
double res = Results(num1, num2);
Console.WriteLine("运算结果：{0}{1}{2}={3}",num1,opter,num2,res);
Console.ReadKey();
}
//操作数的输入方法
public static double InputHelper()
{
double result = 0;
while (true)
{
Console.WriteLine("请输入操作数：");
string numStr = Console.ReadLine();
if (double.TryParse(numStr, out result))
{
break;
}
else
{
Console.Write("输入有误：");
}
}
return result;
}
//运算符的输入
public static double Results(double n1,double n2)
{
bool flag = true;
double res = 0;
while (flag)
{
Console.WriteLine("请输入运算符：");
opter = Console.ReadLine();
switch (opter)
{
case "+": res = n1 + n2; flag = false; break;
case "-": res = n1 - n2; flag = false; break;
case "*": res = n1 * n2; flag = false; break;
case "/": res = n1 / n2; flag = false; break;
default: Console.Write("操作符输入错误！");
break;
}
}
return res;
}
002.计算器的面向对象版本！
class Program
{
static void Main(string[] args)
{
double num1;
double num2;
//找对象
Calculator c = new Calculator();
//调用方法输入
num1 = c.Inputer();
num2 = c.Inputer();
//调用计算方法,得到结果
double res = c.Results(num1, num2);
//输出
Console.WriteLine("{0}{1}{2}={3}",num1,c.opter,num2,res);
Console.ReadKey();
}
}
//创建对象
class Calculator
{
public string opter;
//输入操作数方法
public double Inputer()
{
double n1 = 0;
while (true)
{
Console.WriteLine("请输入操作数：");
string numStr = Console.ReadLine();
if (double.TryParse(numStr, out n1))
{
break;
}
else
{
Console.Write("输入有误：");
}
}
return n1;
}
//根据操作符做计算
public double Results(double n1,double n2)
{
double res = 0;
bool flag = true;
while (flag)
{
Console.WriteLine("请输入操作符：");
opter = Console.ReadLine();
switch (opter)
{
case "+": res = n1 + n2; flag = false; break;
case "-": res = n1 - n2; flag = false; break;
case "*": res = n1 * n2; flag = false; break;
case "/": res = n1 / n2; flag = false; break;
default: Console.Write("输入操作符有误！");
break;
}
}
return res;
}
}
003.计算器的工厂模式版本！
class Program
{
static void Main(string[] args)
{
//数据的初始化
double num1 = InputNums();
double num2 = InputNums();
Console.WriteLine("请输入操作符！");
string opter = Console.ReadLine();
//调用工厂模式
Calculator c = Factory.GetOperational(opter,num1,num2);
double res = c.CalculationResult();
Console.WriteLine(res);
Console.ReadKey();
}
//输入数据方法
public static double InputNums()
{
double nums = 0;
while (true)
{
Console.WriteLine("请输入操作数");
string numStr = Console.ReadLine();
if (double.TryParse(numStr, out nums))
{
break;
}
else
{
Console.Write("输入有误！");
}
}
return nums;
}
}
//工厂模式
class Factory
{
public static Calculator GetOperational(string operational,double n1,double n2)
{
switch (operational)
{
case "+": return new Addition(n1,n2);
case "-": return new Subtraction(n1, n2);
case "*": return new Multiplication(n1, n2);
case "/": return new Division(n1, n2);
default: return new Calculator(n1, n2);
}
}
}
//父类
class Calculator
{
double num1;
public double Num1
{
get { return num1; }
set { num1 = value; }
}
double num2;
public double Num2
{
get { return num2; }
set { num2 = value; }
}
public Calculator(double num1, double num2)
{
this.num1 = num1;
this.num2 = num2;
}
public virtual double CalculationResult()
{
return 0;
}
}
//子类的加(Addition)、减(Subtraction)、乘(Multiplication)、除(Division)
class Addition:Calculator
{
public Addition(double n1, double n2)
: base(n1, n2)
{ }
public override double CalculationResult()
{
return Num1 + Num2;
}
}
class Subtraction:Calculator
{
public Subtraction(double n1, double n2)
: base(n1, n2)
{ }
public override double CalculationResult()
{
return Num1 - Num2;
}
}
class Multiplication:Calculator
{
public Multiplication(double n1, double n2)
: base(n1, n2)
{ }
public override double CalculationResult()
{
return Num1 * Num2;
}
}
class Division:Calculator
{
public Division(double n1, double n2):base(n1,n2)
{
}
public override double CalculationResult()
{
return Num1 / Num2;
}
}
004.计算器的多态抽象方法版本！
class Program
{
static void Main(string[] args)
{
try
{
//新建找对象
Calculator c = null;
//调用输入的方法
double num1 = Inputer();
double num2 = Inputer();
Console.WriteLine("请输入操作符：");
string oper = Console.ReadLine();
//判断操作符
switch (oper)
{
case "+": c = new Addition(); break;
case "-": c = new Subtraction(); break;
case "*": c = new Multiplication(); break;
case "/": c = new Division(); break;//为了避免输入操作符的错误采用try{}catch{}
}
if (c == null)
{
Console.WriteLine("操作符输入有误！");
}
else
{
Console.WriteLine(c.GetResults(num1, num2));
}
}
catch(Exception e)
{
Console.WriteLine(e.Message);
}
Console.ReadKey();
}
public static double Inputer()
{
double nums = 0;
while (true)
{
Console.WriteLine("请输入操作数：");
string numStr = Console.ReadLine();
if (double.TryParse(numStr, out nums))
{
break;
}
else
{
Console.Write("输入的操作数有误：");
}
}
return nums;
}
}
//抽象方法
public abstract class Calculator
{
public abstract double GetResults(double n1,double n2);
}
//子类的实现
class Addition:Calculator
{
public override double GetResults(double n1, double n2)
{
return n1 + n2;
}
}
class Subtraction:Calculator
{
public override double GetResults(double n1, double n2)
{
return n1 - n2;
}
}
class Multiplication:Calculator
{
public override double GetResults(double n1, double n2)
{
return n1 * n2;
}
}
class Division:Calculator
{
public override double GetResults(double n1, double n2)
{
return n1 / n2;
}
}
005.计算器的多态实现版本！
class Program
{
static void Main(string[] args)
{
try
{
//多态的实现新建父类对象
Calculator c = null;
double num1 = Inputer();
double num2 = Inputer();
Console.WriteLine("请输入运算符：");
string oper = Console.ReadLine();
switch (oper)
{
case "+": c = new Addition(num1, num2); break;
case "-": c = new Subtraction(num1, num2); break;
case "*": c = new Multiplication(num1, num2); break;
case "/": c = new Division(num1, num2); break;
}
if (c != null)
{
double res = c.GetResults();
Console.WriteLine(res);
}
else
{
Console.WriteLine("操作符有误！");
}
}
catch
{
Console.WriteLine("操作符输入有误，请按任意键接受！");
}
Console.ReadKey();
}
public static double Inputer()
{
double nums = 0;
while (true)
{
Console.WriteLine("请输入操作数：");
string numStr = Console.ReadLine();
if (double.TryParse(numStr, out nums))
{
break;
}
else
{
Console.Write("输入有误：");
}
}
return nums;
}
}
//创建父类对象
class Calculator
{
double num1;
public double Num1
{
get { return num1; }
set { num1 = value; }
}
double num2;
public double Num2
{
get { return num2; }
set { num2 = value; }
}
public Calculator(double n1, double n2)
{
this.num1 = n1;
this.num2 = n2;
}
public virtual double GetResults()
{
return 0;
}
}
//创建子类对象加(Addition)、减(Subtraction)、乘(Multiplication)、除(Division)
class Addition:Calculator
{
public Addition(double n1, double n2)
: base(n1, n2)
{ }
public override double GetResults()
{
return Num1 + Num2;
}
}
class Subtraction:Calculator
{
public Subtraction(double n1, double n2)
: base(n1, n2)
{ }
public override double GetResults()
{
return Num1 - Num2;
}
}
class Multiplication:Calculator
{
public Multiplication(double n1, double n2)
: base(n1, n2)
{ }
public override double GetResults()
{
return Num1 * Num2;
}
}
class Division:Calculator
{
public Division(double n1, double n2)
: base(n1, n2)
{ }
public override double GetResults()
{
return Num1 / Num2;
}
}
006.计算器的接口工厂模式版本！
class Program
{
static void Main(string[] args)
{
//计算器的接口工厂模式版本
//找对象
ICalculatorable c = null;
double num1 = Inputer();
double num2 = Inputer();
Console.WriteLine("请输入操作符：");
string oper = Console.ReadLine();
c = FactoryCalculator.InitialCalculatorResult(oper, num1, num2);
double result = c.ICalculating();
Console.WriteLine(result);
Console.ReadKey();
}
public static double Inputer()
{
double nums = 0;
while (true)
{
Console.WriteLine("请输入操作数：");
string numStr = Console.ReadLine();
if (!double.TryParse(numStr, out nums))
{
Console.Write("输入有误！");
}
else
{
break;
}
}
return nums;
}
}
//接口版的工厂模式
class FactoryCalculator
{
public static Calculator InitialCalculatorResult(string oper, double n1, double n2)
{
switch (oper)
{
case "+": return new Addition(n1, n2);
case "-": return new Subtraction(n1, n2);
case "*": return new Multiplication(n1, n2);
case "/": return new Division(n1, n2);
default: throw new Exception("操作符输入有误！");
}
}
}
//接口
interface ICalculatorable
{
double ICalculating();
}
//抽象类
abstract class Calculator:ICalculatorable
{
double num1;
double num2;
public double Num2
{
get { return num2; }
set { num2 = value; }
}
public double Num1
{
get { return num1; }
set { num1 = value; }
}
public Calculator(double n1, double n2)
{
this.num1 = n1;
this.num2 = n2;
}
public abstract double ICalculating();
}
//子类的实现
class Addition:Calculator
{
public Addition(double n1, double n2)
: base(n1, n2)
{ }
public override double ICalculating()
{
return Num1 + Num2;
}
}
class Subtraction:Calculator
{
public Subtraction(double n1, double n2)
: base(n1, n2)
{ }
public override double ICalculating()
{
return Num1 - Num2;
}
}
class Multiplication:Calculator
{
public Multiplication(double n1, double n2)
: base(n1, n2)
{ }
public override double ICalculating()
{
return Num1 * Num2;
}
}
class Division:Calculator
{
public Division(double n1, double n2)
: base(n1, n2)
{ }
public override double ICalculating()
{
return Num1 / Num2;
}
}
007.计算器的抽象工厂模式版本！
class Program
{
static void Main(string[] args)
{
//计算器的抽象工厂模式版本
//找对象
Calculator c = null;
double num1 = Inputer();
double num2 = Inputer();
Console.WriteLine("请输入操作符：");
string oper = Console.ReadLine();
c = FactoryCalculator.InitialCalculator(oper, num1, num2);
double result = c.InitialCalculating();
Console.WriteLine(result);
Console.ReadKey();
}
public static double Inputer()
{
double nums = 0;
while (true)
{
Console.WriteLine("请输入操作数：");
string numStr = Console.ReadLine();
if (!double.TryParse(numStr, out nums))
{
Console.Write("输入有误：");
}
else
{
break;
}
}
return nums;
}
}
//工厂
class FactoryCalculator
{
public static Calculator InitialCalculator(string oper,double n1,double n2)
{
switch (oper)
{
case "+": return new Addition(n1, n2);
case "-": return new Subtraction(n1, n2);
case "*": return new Multiplication(n1, n2);
case "/": return new Division(n1, n2);
default: throw new Exception("系统找不到指定运算符...");
}
}
}
//抽象类的工厂模式与多态工厂模式几乎一样
abstract class Calculator
{
double num1;
double num2;
public double Num2
{
get { return num2; }
set { num2 = value; }
}
public double Num1
{
get { return num1; }
set { num1 = value; }
}
public Calculator(double n1, double n2)
{
this.num1 = n1;
this.num2 = n2;
}
public abstract double InitialCalculating();
}
//子类的实现
class Addition:Calculator
{
public Addition(double n1, double n2)
: base(n1, n2)
{ }
public override double InitialCalculating()
{
return Num1 + Num2;
}
}
class Subtraction:Calculator
{
public Subtraction(double n1, double n2)
: base(n1, n2)
{ }
public override double InitialCalculating()
{
return Num1 - Num2;
}
}
class Multiplication:Calculator
{
public Multiplication(double n1, double n2)
: base(n1, n2)
{ }
public override double InitialCalculating()
{
return Num1 * Num2;
}
}
class Division:Calculator
{
public Division(double n1, double n2)
: base(n1, n2)
{ }
public override double InitialCalculating()
{
return Num1 / Num2;
}
}
008.计算器的多态接口版本！
class Program
{
static void Main(string[] args)
{
try
{
//创建对象
ICalculatorable c = null;
double num1 = Inputer();
double num2 = Inputer();
Console.WriteLine("请输入操作符：");
string oper = Console.ReadLine();
switch (oper)
{
case "+": c = new Addition(num1, num2); break;
case "-": c = new Subtraction(num1, num2); break;
case "*": c = new Multiplication(num1, num2); break;
case "/": c = new Division(num1, num2); break;
}
if (c != null)
{
double res = c.ICalculating();
Console.WriteLine(res);
}
else
{
Console.WriteLine("操作符输入有误！");
}
}
catch
{
Console.WriteLine("输入有误！");
}
Console.ReadKey();
}
public static double Inputer()
{
double nums = 0;
while (true)
{
Console.WriteLine("请输入操作数：");
string numStr = Console.ReadLine();
if (!double.TryParse(numStr, out nums))
{
Console.WriteLine("操作数输入有误！");
}
else
{
break;
}
}
return nums;
}
}
//接口的使用
interface ICalculatorable
{
double ICalculating();
}
//抽象类的使用
abstract class Calculator:ICalculatorable
{
double num1;
public double Num1
{
get { return num1; }
set { num1 = value; }
}
double num2;
public double Num2
{
get { return num2; }
set { num2 = value; }
}
public Calculator(double n1, double n2)
{
this.num1 = n1;
this.num2 = n2;
}
public abstract double ICalculating();
}
//子类的实现
class Addition:Calculator
{
public Addition(double n1, double n2)
: base(n1, n2)
{ }
public override double ICalculating()
{
return Num1 + Num2;
}
}
class Subtraction:Calculator
{
public Subtraction(double n1, double n2)
: base(n1, n2)
{ }
public override double ICalculating()
{
return Num1 - Num2;
}
}
class Multiplication:Calculator
{
public Multiplication(double n1, double n2)
: base(n1, n2)
{ }
public override double ICalculating()
{
return Num1 * Num2;
}
}
class Division:Calculator
{
public Division(double n1, double n2)
: base(n1, n2)
{ }
public override double ICalculating()
{
return Num1 / Num2;
}
}
希望能帮助到各位！