How to control the volume of digits to seem once the decimal-level character for a double variable? 2 Jerry CoffinJerry Coffin 493k8383 gold badges652652 silver badges1.1k1.1k bronze badges 7 twelve Observe that g++ rejects %lf when compiling with -Wall -Werror -pedantic: error: ISO C++ doesn't support the ‘%lf’ gnu_printf format https://isaacb333xof2.plpwiki.com/user