What is the difference between isdigit() and isnumber()?
isnumber() may be an Apple-specific C++ method (I don’t have a Mac on hand to check). You can see it in the Apple dev guide: The isnumber() function behaves similarly to isdigit(), but may recognize additional characters, depending on the current locale setting. Besides, isnumber() is not declared on Linux: I use g++ 6.1.1 on Linux 4.7.2 and get the error: I … Read more