### 11.2.4.3 EN Editing

The EN data edit descriptor transfers values by using engineering notation. It takes the following form:

``` ENw.d[Ee]
```

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).

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 EN data edit descriptor transfers w characters from an external field and assigns their real value to the corresponding I/O list item. The EN descriptor interprets and assigns input data in the same way as the F data edit descriptor (see Section 11.2.4.1).

The following shows input using the EN edit descriptor (the symbol ^ represents a nonprinting blank character):

```Format     Input           Value
EN11.3      ^^5.321E+00       5.32100
EN11.3      -600.00E-03       -.60000
EN12.3     ^^^3.150E-03        .00315
EN12.3     ^^^3.829E+03    3829.0
```

Rules for Output Processing

On output, the EN data edit descriptor transfers 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 real value is output in engineering notation, where the decimal exponent is divisible by 3 and the absolute value of the significand is greater than or equal to 1 and less than 1000 (unless the output value is zero).

The w should be greater than or equal to d+9 to allow for the following:

• A sign (optional if the value is positive and descriptor SP is not in effect)

• One to three digits 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
ENw.d  |exp| <= 99  E+nn  E-nn
99 < |exp| <= 999 +nnn  -nnn
ENw.dEe  |exp| <= 10e - 1   E+n1n2...ne   E-n1n2...ne

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; if omitted, the default value is 2. If e is specified, the w should be greater than or equal to d+e+5.

The following shows output using the EN edit descriptor (the symbol ^ represents a nonprinting blank character):

```Format     Value         Output
EN11.2     475867.222    ^475.87E+03
EN11.5     475867.222    ***********
EN12.3          0.00069  ^690.000E-06
EN10.3         -0.5555   **********
EN11.2          0.0      ^000.00E-03
```