Working with header files

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Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? Please use ide. Like Article. Previous How to write your own header file in C?

Next A nested loop puzzle. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. The declaration tells the compiler whether the element is an int , a double , a function , a class or some other thing.

Furthermore, each name must be declared directly or indirectly in every. When you compile a program, each. The compiler has no knowledge of what names are declared in other compilation units. That means that if you define a class or function or global variable, you must provide a declaration of that thing in each additional.

Each declaration of that thing must be exactly identical in all files. A slight inconsistency will cause errors, or unintended behavior, when the linker attempts to merge all the compilation units into a single program.

You make the declarations in a header file, then use the include directive in every. I believe the issue is that you aren't linking the calculator files with the main when compiling. Try this:. If you are not linking the the files with main correctly, then you won't be able to compile it correctly.

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