### 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+10[1]        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            *********
```