c++

[shahid76]

what are rules for defining a variable in c-c++?

[Banfa]

Only do it where it is legal.
Only give it a valid name.


May I suggest you read a text book (pretty much anyone would do) and variables will be one of the first things covered.

[palani12kumar]

1.The varirable name should not be the same asthe built in keywords.
2.It shoul not start with a numeric.
3.Some Compilers may allow you to declare a variable name with '_'(underscore)
as the first letter...
and many more like this

[Roonie]

while it is legal to declare variables and functions beginning with an underscore, it is discouraged to do so . . . these are typically reserved for compile macros and functions. they use an underscore so that there is no conflict with any variables you might declare. the underscore keeps things seperate.