The G field descriptor transfers real values in a form that, in effect, combines the F and E field descriptors. It takes the following form:
Gw.d[Ee]
The corresponding I/O list element must have a real data type, or it must be either the real or the imaginary part of a complex data type.
In an input statement, the G field descriptor transfers w characters from the external field and assigns them as a real value to the corresponding I/O list element. The G field descriptor interprets and assigns data in exactly the same way as the F (and E and D) field descriptors (see Section 8.3.2.1).
| Data Magnitude | Effective Conversion |
|---|---|
| m < 0.1 | Ew.d[Ee] |
| 0.1 <= m < 1.0 | F(w-4).d, n(' ') |
| 1.0 <= m < 10.0 | F(w-4).(d-1), n(' ') |
... | ... |
| 10**d-2 <= m < 10**d-1 | F(w-4).1, n(' ') |
| 10**d-1 <= m < 10**d | F(w-4).0, n(' ') |
| m >= 10**d | Ew.d[Ee] |
The n (' ') field descriptor, which is, in effect, inserted by the G field descriptor for values within its range, specifies that four or e+2 spaces are to follow the numeric data representation.
The term w must be large enough to include all of the following:
Therefore, w must be greater than or equal to d+8. If e is present, w must be greater than or equal to d+e+6.
The following list illustrates valid output processing using the G field descriptor (the symbol ^ represents a nonprinting space character):
Format Internal Value External Representation G13.6 0.01234567 ^0.123457E-01 G13.6 -0.12345678 -0.123457^^^^ G13.6 1.23456789 ^^1.23457^^^^ G13.6 12.34567890 ^^12.3457^^^^ G13.6 123.45678901 ^^123.457^^^^ G13.6 -1234.56789012 ^-1234.57^^^^ G13.6 12345.67890123 ^^12345.7^^^^ G13.6 123456.78901234 ^^123457.^^^^ G13.6 -1234567.89012345 -0.123457E+07
The following list shows the same values output-processed as the previous list, except the following list uses an equivalent F field descriptor(the symbol ^ represents a nonprinting space character):
Format Internal Value External Representation F13.6 0.01234567 ^^^^^0.012346 F13.6 -0.12345678 ^^^^-0.123457 F13.6 1.23456789 ^^^^^1.234568 F13.6 12.34567890 ^^^^12.345679 F13.6 123.45678901 ^^^123.456789 F13.6 -1234.56789012 ^-1234.567890 F13.6 12345.67890123 ^12345.678901 F13.6 123456.78901234 123456.789012 F13.6 -1234567.89012345 *************