Intel® Fortran Compiler 17.0 Developer Guide and Reference
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.
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.
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+10 210.5271E10 BZ,D10.2 12345^^^^^ 12345000.0D0 D10.2 ^^123.45^^ 123.45D0 D15.3 367.4981763D+04 3.674981763D+06
If the I/O list item is single-precision real, the E edit descriptor treats the D exponent indicator as an E indicator.
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 an exponent exceeds its specified or implied width, or the number of characters produced exceeds the field width, the entire field of width w is filled with asterisks. However, the field width is not filled with asterisks if the field width is exceeded when optional characters are omitted.
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.
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.
For an internal value that is an IEEE infinity or an IEEE NaN, the form of the output field is the same as for Fw.d.
A negative value that is not zero but rounds to zero on output is displayed with a leading minus sign. For example, the value -0.01 in "-5P,E20.5" format will be displayed as -0.00 rather than as 0.00. The setting of compiler option assume [no]std_minus0_rounding can affect this behavior.
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 *********