C compile errors: stray '\200' in program and expected ')' before numeric constant

Question

I copied this program and am having trouble with the void downFrequency function (I think). This is for Arduino Uno. Here are the compiler errors: Compiling \'MY_dds\' for

Answer 1

Simple copy always mess up the source code.

One can check the "stray" problem via cat -A yoursrc.c

To me, I usually reformat the code by vim in two steps.

vim yoursrc.c
:%!tr -cd '[:print:]\n'

Then compile gcc yoursrc.c