Linker error

[ichiben]

I am trying to compile a linked list implementation file that includes a linked list header file. I get this error.

In function `_start':
: undefined reference to `main'
collect2: ld returned 1 exit status


I know that since the implementation file is a cpp file without a main function, it needs some sort of special command when compiling, but I don't know what it is.

[GCDEF]

You can compile, but you can't link without a main function.

[ichiben]

Oh. My professor has shown in his lecture sample code in this same format with the class interface in a header file and the class implementation in a cpp file that includes the header file.

[Speedo]

Oh. My professor has shown in his lecture sample code in this same format with the class interface in a header file and the class implementation in a cpp file that includes the header file.

In real world usage those files would be included in a larger project, which will have a main function somewhere else. Or, you could make them into a library instead of an executable program, you just have to change your linker settings.

[Peter_APIIT]

int main() is like an entry point to your's program.
You can put the implementation file at main file but not recommended or include header file at main file.