What is different between return & return not?

Answer 1

Your question seem unclear
return not will make your condition opposite suppose u written like this
return !0; it will return 1

Is it or you asking for without return type void

Answer 2

What is not return?

Answer 3

Sorry i mean return not

Answer 4

It is Ok thanks

Answer 5

Return is for returning a below from a function. If you don't use return, you won't return a value from the function. Simple =)