Decimal number format and region coding

Question

I have lua program, that loads data from string. I need to convert those data to double, using tonumber. Problem is, that under cygwin in Windows 7, I got nil, if number contains . insetad of ,. How to solve this ?

n = tonumber("7.5") -> gives nil
n = tonumber("7,5") -> gives 7.5

Answer 1

Try this:

old = os.setlocale("C")
n = tonumber("7.5")
os.setlocale(old)