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原标题:Problems overloading the << Operator

我试图超载“带”和“带”;我的货币类别操作员,但我发现这一汇编错误:C2143: syntax差错:失踪;

在我的档案中,我有:

 friend ostream &operator << (ostream &, const Currency&);

在我的货币档案中,我有:

    ostream &operator << (ostream &stream, const Currency &obj){
      stream<<"$"<<obj.dollars<<"."<<obj.cents;
      return stream;
      }

直到现在为止,一切都做了罚款,但是,一旦我说:

我的档案有以下内容:

    #ifndef CURRENCY_H
    #define CURRENCY_H

  #include<iostream>
  #include<string>
  #include<ostream>
  #include<sstream>

  class Currency; //forward delcaration

  //Function prototypes for overloaded stream operators
  ostream &operator << (ostream &, const Currency &);

我对我错做什么没有想法。 帮助将是巨大的。 增 编

最佳回答

<代码>ostream在<编码>上公布,姓名载于,而您缺失<代码>std::<> 收到的识别资料:

std::ostream &operator << (std::ostream &, const Currency &);

如果你想避免<代码>std: 然后,在主机存档之后,你可以提出<条码>,使用名称

...
#include<ostream>
using namespace std;  // this is not desirable though in real world programming

ostream &operator << (ostream &, const Currency &);

<><>Edit>: using namespace <> is not recommended in real world program at the file Superior. 我只把这个部分放在了青年论坛。

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