I tried to program a game similar to space invaders in C++ using my broland 5.5 compiler, but when I compile I get the message
I've never had an error in the .obj file before, and I have NO idea what this means. I was going to post the substring function that I programmed in, but I don't think that the error would be in it, because I've used the exact same function flawlessly before. This comes after all the other errors, so it's not like I even have a line number to look at. Any ideas as to what could cause this?

i think you have declared that function as extern in your main file, and then when the linker tries to actually go look for it in one of your include files, it can't find it. sure you have it spelled same in both places? I haven't looked this error up or encountered it, but this is the first thing that came to my mind, so if it's not correct, my apologies

This is actually a linker error that is caused by having substring defined but when the program is trying to link the obj files together it cannot find the implementation. If you are sure that the implementation is there, try to make sure that you have the exact same declarations as what your function is calling for.

This often happens to me when I am moving my function prototypes and function implementations around in my code to organize it or if I delete something in a function header and forget to rewrite it before I start the compile process. Check your function headers and make sure they're all there.

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-Aaron

You guys were right, there were three functions that I had changed, and forgot to change the declarations. Thanks guys! I'll keep that in mind for next time!