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

Macro Concatenation in C/C : An Alternative Approach

When it comes to string concatenation with macros in C/C , most developers instinctively resort to passing arguments to a dedicated macro function. However, is there a more direct way to accomplish this task?

Consider the following example:

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

The goal here is to concatenateSTR1 and STR2 to form "s1." Using the traditional method, one might do the following:

#define CONCAT(x, y) x ## y
#define STR3 CONCAT(STR1, STR2)

But is there a way to achieve this without the additional function?

Direct Macro String Concatenation

For strings in C/C , there is indeed a straightforward solution:

#define STR3 STR1 STR2

This macro expands to:

#define STR3 "s" "1"

In C, separating strings with spaces as in "s" "1" is equivalent to a single string, "s1."

Conclusion

While the traditional method with an additional macro function is versatile and can handle more complex cases, the direct approach outlined here provides a convenient and efficient way to concatenate strings when using macro expansion.

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