You should have kept with the original thread.

As for your doubts regarding whether you can declare a separate string for each message - you can choose whether you have separate strings or you can have a table of strings. Get a good 'c' book and read.

As for your original problem - when things don't make sense, take it back to the bare minimum. Copy your file and start with a simple file. Get that to compile then start to add more and more. This will localise your problem down to the line. No magic here. If you can't resolve the problem at least you will have localised it - then you can place the block of code here and mark the line that the compiler is complaining about. You'll probably will have solved your problem by then without our assistance. We all had to start out knowing very little and I've had similar problems with the compiler complaining - in all cases it was my fault and I used the above method to find the problem. Divide and conquer!