What does an 'F' in the Format specifier of printf mean?

What does %.8Ff format specifier in printf do?

What do开发者_开发问答es F mean?

According to the manual:

The F conversion specifier produces "INF", "INFINITY", or "NAN" instead of "inf", "infinity", or "nan", respectively.

In your format string %.8Ff, the f is treated as a literal character and printed as an f.

One possible use of putting a literal f after the format specifier could be to print a string that's later to be parsed by a C or C++ compiler as a float constant instead of double constant.