What is c printf %f default precision?

Question

I'm curious:

If you do a printf("%f", number); what is the precision of the statement? I.e. How many decimal places will show up? Is this compiler dependent?

Answer 1

The ANSI C standard, in section 7.19.6.1, says this about the f format specifier:

If the precision is missing, 6 digits are given

Answer 2

The default precision for %f is 6 digits (see ISO C99 specification, 7.19.6.1/7).