请问下，我编译ex8_6.cpp报错，代码拷贝跟您一样的也报错

[likui911]

d:/Source/CppPrimer/chapter08/ex8_6.cpp:15: undefined reference to read(std::istream&, Sales_data&)' d:/Source/CppPrimer/chapter08/ex8_6.cpp:17: undefined reference toread(std::istream&, Sales_data&)' d:/Source/CppPrimer/chapter08/ex8_6.cpp:19: undefined reference to Sales_data::combine(Sales_data const&)' d:/Source/CppPrimer/chapter08/ex8_6.cpp:21: undefined reference toprint(std::ostream&, Sales_data const&)' d:/Source/CppPrimer/chapter08/ex8_6.cpp:25: undefined reference to `print(std::ostream&, Sales_data const&)'

[pezy]

你有这句吗？

include "../ch07/ex7_26.h"

路径文件可都对？

[likui911]

后来查了下，是g++编译的事情，vscode编译脚本没有编译ex7_26.cpp导致的 后来更新了编译脚本就可以了。