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I figured out what was wrong. 2 typos. i<=b/2 instead of i=b/2 and

for(int i=0;i< counter-1;i++) instead of for(int i;i< counter-1;i++).

Thanks!

Dev C++

My compiler did not warn me about any variable being used without having been initialized. What is this variable?
Also, when I run the code or when I click on the debug button, the console pops out...

I created a .txt file that I called in.txt. It has the letters: a b c d e.
I put it in the same folder as the c++ code below. I was hoping that I after I compile and run the code, the in.txt file...