Can C/C Macros Directly Concatenate Strings Without Helper Functions?

Concatenating Strings Using Macros in C/C

In C/C , macros can be employed to concatenate strings. A common question arises: is it possible to directly concatenate strings defined as macros, without resorting to intermediate macro functions?

Consider the following example:

#define STR1 "s"
#define STR2 "1"
#define STR3 STR1 ## STR2

The goal is to concatenate STR1 and STR2 to obtain "s1" as the value of STR3. Using another macro function to pass arguments is an option, but is there a simpler method?

Direct Concatenation

Indeed, there is a straightforward way to concatenate strings directly using macros:

#define STR3 STR1 STR2

This definition results in the following expansion:

#define STR3 "s" "1"

In C, concatenating strings by separating them with a space ("s" "1") is equivalent to having a single string ("s1"). Therefore, this approach effectively achieves the desired string concatenation.

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