### 11.2.4.2 E and D Editing

The E and D data edit descriptors transfer real values in exponential form. They take the following form:

  Ew.d[Ee]
  Dw.d

For the E edit descriptor, the value of d (the number of places after the decimal point) plus e (the number of digits in the exponent) must not exceed the value of w (the field width).

For the D edit descriptor, the value of d must not exceed the value of w.

The specified I/O list item must be of type real, or it must be the real or imaginary part of a complex type.

Rules for Input Processing

On input, the E and D data edit descriptors transfer w characters from an external field and assigns their real value to the corresponding I/O list item. The E and D descriptors interpret and assign input data in the same way as the F data edit descriptor (see Section 11.2.4.1).

The following shows input using the E and D edit descriptors (the symbol ^ represents a nonprinting blank character):

    Format        Input             Value
    E9.3          734.432E3           734432.0
    E12.4         ^^1022.43E            1022.43E-6
    E15.3         52.3759663^^^^^         52.3759663
    E12.5         210.5271D+101        210.5271E10
    BZ,D10.2      12345^^^^^        12345000.0D0
    D10.2         ^^123.45^^             123.45D0
    D15.3         367.4981763D+04          3.674981763D+06

1 If the I/O list item is single-precision real, the E edit descriptor treats the D exponent indicator as an E indicator.

Rules for Output Processing

On output, the E and D data edit descriptors transfer the real value of the corresponding I/O list item, right-justified and rounded to d decimal positions, to an external field that is w characters long.

The w should be greater than or equal to d+7 to allow for the following:

- A sign (optional if the value is positive and descriptor SP is not in effect)
- An optional zero to the left of the decimal point
- The decimal point
- The d digits to the right of the decimal point
- The exponent

The exponent takes one of the following forms:

Edit Descriptor | Absolute Value of Exponent | Positive Form of Exponent | Negative Form of Exponent
--- | --- | --- | ---
Ew.d | |exp| <= 99 | E+nn | E-nn
| 99 < |exp| <= 999 | +nnn | -nnn
Ew.dEe | |exp| <= 10e - 1 | E+n1n2...ne | E-n1n2...ne
Dw.d | |exp| <= 99 | D+nn or E+nn | D-nn or E-nn
| 99 < |exp| <= 999 | +nnn | -nnn

If the exponent value is too large to be converted into one of these forms, an error occurs.

The exponent field width (e) is optional for the E edit descriptor; if omitted, the default value is 2. If e is specified, the w should be greater than or equal to d+e+5.

  Note: The w can be as small as d+5 or d+e+3, if the optional fields for the sign and the zero are omitted.

The following shows output using the E and D edit descriptors (the symbol ^ represents a nonprinting blank character):

    Format       Value               Output
    E11.2        475867.222            ^^^0.48E+06
    E11.5        475867.222               0.47587E+06
    E12.3             0.00069           ^^^0.690E
    E10.3            -0.5555              -0.556E+00
    E5.3             56.12               *****
    E14.5E4          -1.001              -0.10010E+0001
    E13.3E6           0.000123            0.123E-000003
    D14.3             0.0363         ^^^^^0.363D-01
    D23.12         5413.87625793     ^^^^^0.541387625793D+04
    D9.6              1.2            *********

For More Information:

- On the form for data edit descriptors, see Section 11.2.1.
- On general rules for numeric editing, see Section 11.2.2.
- On the scale factor, see Section 11.3.5.

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