Question

I want a debug function-macro that works like this:

int myVar = 5;
PRINTVAR(myVar); // macro

// which expands to something like...
print("myVar: ");
println(myVar);

Basically, I want to use the identifier as a string literal as well as a variable.

I’m just getting a bit sick of repeating myself when I want to dump out a whole lot of variables to the stdout.

My silly attempt, which of course doesn’t work:

#define PRINT_VAR(x) Serial.print("x: "); Serial.println(x);

Is this possible?

Answer 1

The “stringizing operator” is designed for precisely this case:

#define PRINT_VAR(x) (print(#x ": "), println(x))