简单工厂模式计算器

来源：互联网发布：it服务内容编辑：程序博客网时间：2024/06/05 17:33

class Operation
{
private decimal _numberA = 0;
private decimal _numberB = 0;

public decimal numberA
{
get { return _numberA; }
set { _numberA = value; }
}
public decimal numberB
{
get { return _numberB; }
set { _numberB = value; }
}

public virtual decimal GetResult()
{
decimal result = 0;
return result;
}
}

class OperationAdd : Operation
{
public override decimal GetResult()
{
decimal result = 0;
result = numberA + numberB;
return result;
}
}
class OperationSub : Operation
{
public override decimal GetResult()
{
decimal result = 0;
result = numberA - numberB;
return result;
}
}
class OperationMul : Operation
{
public override decimal GetResult()
{
decimal result = 0;
result = numberA * numberB;
return result;
}
}

class OperationDiv : Operation
{
public override decimal GetResult()
{
decimal result = 0;
if (numberB == 0)
{
throw new Exception("除数不能为0。");
}
result = numberA / numberB;
return result;
}
}

class OperationFactory
{
public static Operation createOperate(string operate)
{
Operation oper = null;
switch (operate)
{
case "+":
oper = new OperationAdd();
break;
case "-":
oper = new OperationSub();
break;
case "*":
oper = new OperationMul();
break;
case "/":
oper = new OperationDiv();
break;
}
return oper;
}
}

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