Question

I need to use a field of type numeric(11,9) in mysql. I’m using C api so which data type I should use. I used long so it gives result like these:

12.123456789 to 12.123457000

I don’t want to lose precision. I think I should use long double – but what specifier (%_) should I use? For long it’s %f, but what it’s for long double?

Answer 1

long double d = 12.123456789;
printf ("%.9lf", d);

whenever you have less than 9 digits after the decimal, it will be filled with zeroes.