How to auto-include all headers in directory

Question

I\'m going through exercises of a C++ book. For each exercise I want to minimize the boilerplate code I have to write. I\'ve set up my project a certain way but it doesn\'t seem

Answer 1

sed -i 's/\<\\([eE]\\)[0-9]+\\>/\19999/' main.cpp

Replace 9999 with the required number. There might be better ways.