C ++缺省参数错误 [英] C++ Default Argument Error

问题描述

任何想法为什么这个错误会在编译时出现？

Any Idea why this error is coming up at compile time?

ComplexNumber.cpp:21: error: default argument given for parameter 1 of ‘void ComplexNumber::print(std::ostream&) const’
ComplexNumber.h:17: error: after previous specification in ‘void ComplexNumber::print(std::ostream&) const’

这些是我在这些特定区域的代码：

Here is my code at those certain areas:

ComplexNumber.cpp

ComplexNumber.cpp

21    void ComplexNumber::print(ostream & out = cout) const {

ComplexNumber.h

ComplexNumber.h

17    void print(ostream & out = cout) const;

推荐答案

您应该只在函数声明中指定默认参数，即在报头中。您的实现应该看起来像这样：

You should only specify the default parameter in the function declaration, i.e. in the header. You implementation should look something like this:

void ComplexNumber::print(ostream & out) const { ..... }

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