public static Operation createOperiton(String operation)
{
Operation oper = null;
switch(operation)
{
case "+":
{
oper = new OperationAdd();
break;
}
case "-":
{
oper = new OperationSub();
break;
}
case "*":
{
oper = new OperationMul();
break;
}
case "/":
{
oper = new OperationDev();
break;
}
default:
{
throw new Exception("输入操作符出错");
}
}
return oper;
}
public static Operation CreatOperation(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;
}