Is number and NuMber identical

[Richa Chhabra]

Is there any validation on character case as well in C++

[weaknessforcats]

Everything in C++ is case-sensitive.

[Frinavale]

Just in case you didn't understand the point that weaknessforcats was trying to make...

No, number and NuMber are not identical because everything in C++ is case-sensitive.

-Frinny

[donbock]

It depends on what they are. For example, in this case they are indeed identical and interchangeable :

#define NumBer number

It depends on what you mean by identical. For example, in this case they are separate and distinct variables that happen to have the same [identical] value.

int NumBer = 4;
int number = 4;

Please provide a little more background about your question.

To answer your inline question: neither C nor C++ validate names. You give a name and the compiler looks it up in an internal table. The lookup is case sensitive. The lookup either succeeds or fails; the compiler has no way to tell that you really meant to give a different name.

On the other hand, filenames might be case-insensitive depending on the operating system. In this case, the compiler doesn't look up the [file]name; instead it passes the filename to the operating system. It is the operating system that looks up the filename. DOS and Windows have case-insensitive filenames; UNIX has case-sensitive filenames.