format specifier to store log output

my output for log is log(65536)

ans =

11.090354888959125

i want to store this in file. But i am not getting right format specifier which will save all bits of it. I tried with %f which is saving only 6 digits after decimal point.

please help me in this.

Thank you

Answer 1

[dpb]

Use the precision specifier on the format string. From

help fprintf

    FORMAT is a string that describes the format of the output fields, and
    can include combinations of the following:

       * Conversion specifications, which include a % character, a
         conversion character (such as d, i, o, u, x, f, e, g, c, or s),
         and optional flags, width, and precision fields.  For more
         details, type "doc fprintf" at the command prompt.