C++默认参数错误

Question

任何想法为什么这个错误在编译时出现？

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’

这是我在这些特定领域的代码:

ComplexNumber.cpp

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

ComplexNumber.h

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

Answer 1

您应该只在函数声明中指定默认参数,即在标题中.您的实现应该看起来像这样:

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