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I'm trying to learn C++ using Xcode however the line #include "Sales_item.h" produces an error. Both files are in the same directory which is the project open in Xcode. I cannot figure out how to set the header search path in Xcode which may be the problem. Here is all of the code:

#include <iostream>
#include "Sales_item.h"

int main()
{
    Sales_item book;
    std::cin >> book;
    std::cout << book << std::endl;
    return 0;
}
Tyler Bloom
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  • "operator<<(std::__1::basic_ostream >&, Sales_item const&)", referenced from: "operator>>(std::__1::basic_istream >&, Sales_item&)", referenced from: clang: error: linker command failed with exit code 1 (use -v to see invocation) – Tyler Bloom Sep 21 '17 at 02:18
  • the error is definitely from the line I mentioned and it is not a typo error I have been trying to figure this out for many hours – Tyler Bloom Sep 21 '17 at 02:19
  • This seem to be a linker error, where the linker is looking for `operator<<` for `Sales_item`. From this part of the code it is hard to tell why it cannot find it (unless, of course, you haven't implemented it yet or forgot to add the source file to the project). – Bo Persson Sep 21 '17 at 02:26
  • What is a linker? How do I implement the file? The file is in the project – Tyler Bloom Sep 21 '17 at 02:38
  • these are the contents of the folder which is open in xcode, the latter containing the code I wrote in the question: Sales_item.h main.cpp – Tyler Bloom Sep 21 '17 at 02:39
  • A linker is a program that pulls together several compiled files and builds the program file from those. It tries to fix things like calling a function in another file. "Implement" just means "to write the code". :-) One way to get your problem is to use a function or operator that you haven't written yet. But there are many other ways: [What is an undefined reference?](https://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix) – Bo Persson Sep 21 '17 at 02:51
  • Ok so how do I get the linker within Xcode to pull the file Sales_item.h? – Tyler Bloom Sep 21 '17 at 03:39

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