Question

I need to define many variables and I don’t want to do it one by one. Plus, I want to learn more about macros. So let’s say I have to define x1, x2, x3, x4, x5 like this:

int x1;
int x2;
int x3;
int x4;
int x5;

Can I do it with a macro? like this:

#define defint(i) int x(i)//x(i) does not work. I need to somehow combine x and i. How??

and then make a for loop for how many variables I want to define?

UPDATE: I’ll use it to define many handlers for many traps in some code for an Operating system and hence I don’t want to use array (I want my bootloader to be as small as possible :P)

UPDATE2: seems I have to make myself more clear. Since it’s os code, so it also has assembly code. so half code is in C and half in asm. I define all variables via macro in assembly and use them in C declaring them extern :).

Answer 1

Use token pasting:

#define DEFINT(i) int x ## i

Also, see how I did not include the trailing semi-colon, since you want that when the macro is used, to make it look like a statement.