Are these valid cases for a switch statement in c++ ?

Question

non-constant integers

constant characters

non-constant characters

constant floating points

are these usable as cases in a switch statement in the c++ language

Answer 1

The C and C++ standards require cases to reduce to an integer constant. A constant character reduces to one (promotes, technically). A constant floating point does not.

Being able to use a const floating point would be a useless feature anyway. Comparing a floating point number (for equality) to anything other than zero gives unpredictable results.

So the answers are: no, yes, no, no. You didn't ask about constant integers, but the answer is yes.

Answer 2

non constant characters and non-constant integers can not be case in switch statement

mm some explaining...

switch(variable)

case: constant

variable can be lets say integer type from 1 to 10

case: its constant e.g.

case 1:

some statement

break;

case 2:

some statement

break.

1 and 2 are numeric hard values and are constant