HP Fortran Programmer's Reference

The magnitude is less than 0.1 but not zero.
The magnitude is greater than or equal to 10**d (after rounding to d digits).
I/O formatting
Edit descriptors
If the magnitude does not fit either of these rules, the F edit descriptor is used. When F is
used, the field width is reduced by either 4 when Gw.d is specified, or by e+2 when Gw.dEe is
specified. It is then followed by a number of trailing spaces equal to the number that the field
width was reduced by. Finally, d is modified internally according to the new field width.
For fixed- or floating-point format descriptors, the field width is w. The value is rounded to d
digits, and the exponent consists of e digits. If Ee is omitted, the exponent occupies two
positions. If Ee is omitted and the exponent is greater than 99 (that is, it requires three
digits), the exponent letter is dropped from the output. The field width, w, should follow the
general rule: w isgreaterthanorequaltothesumofd+7; or, if Ee is specified, w is greater
than or equal to the sum of d+e+5. This rule provides positions for a leading blank, the sign of
the value, d digits, the decimal point, and, if needed, the exponent letter (D, E, orQ), the sign of
the exponent, and the exponent. Note that the Ee, De, andQe specifications control which
exponent letter is output.
Table9-14providesexamplesoftheGeditdescriptor on output.
Table 9-14 G edit descriptor: output examples
Descriptor Internal value Interpretation Output
G10.3 +1234.0 E10.3 b0.123E+04
G10.3 -1234.0 E10.3 -0.123E+04
G12.4 +12345.0 E12.4 bb0.1235E+05
G12.4 +9999.0 F8.0, 4X bbb9999.bbbb
G12.4 -999.0 F8.1, 4X bb-999.0bbbb
G7.1 +.09 E7.1 0.9E-01
G5.1 -.09 E5.1 *****
G11.1 +9999.0 E11.1 bbbb0.1E+05
G8.2 +9999.0 E8.2 0.10E+05
G7.2 -999.0 E7.2 *******
G8.2 .true L8 bbbbbbbT
G7.2 -999.0 E7.2 bbbb1234
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