Hexadecimal Value In C++ Switch Statement

Question

Is it possible to perform a switch with a hexadecimal case statement?

for example:

switch (integer) {
    case: 1
         function();
         break;
    case: F:
         function();
         break;
}

g++ complains saying:

example.cpp: In function ‘int main()’:
example.cpp:148:18: error: ‘F’ was not declared in this scope

I assume the compiler is trying to treat F as a variable. I know instead of F I could just use the value 15 but hex would be more convenient.

Solutions for other control statements would be nice too.

Answer 1

In C, and presumably C++ as well, you can use any integer constant in a switch statement. That's not your problem.

Your problem is that F isn't a constant, it's a variable name. To specify your constant in hex, use a leading 0x, e.g. 0xf.

The same thing applies in any other context that can take a (decimal) value - you get hex by using a leading 0x. Or if you want octal for some reason, use a leading 0, without the x.

Thus 017, 0xf and 15 are all the same number, and can be used interchangeably in c.