How to regulate the volume of digits to appear after the decimal-place character for a double variable? 2 Jerry CoffinJerry Coffin 493k8383 gold badges652652 silver badges1.1k1.1k bronze badges 7 twelve Notice that g++ rejects %lf when compiling with -Wall -Werror -pedantic: mistake: ISO C++ doesn't help the ‘%lf’ gnu_printf structure https://gunnerkqrok.topbloghub.com/43295593/acoustic-secondary-glazing-no-further-a-mystery