Intel® Fortran Compiler 16.0 User and Reference Guide
A REAL(8) or DOUBLE PRECISION constant has more than twice the accuracy of a REAL(4) number, and greater range.
A REAL(8) or DOUBLE PRECISION constant occupies eight bytes of memory. The number of digits that precede the exponent is unlimited, but typically only the leftmost 15 digits are significant.
IEEE T_floating format is used.
Note that compiler option double-size can affect DOUBLE PRECISION data.
The default KIND for DOUBLE PRECISION is affected by compiler option double-size.
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123456789D+5 |
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123456789E+5_8 |
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+2.7843D00 |
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-.522D-12 |
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2E200_8 |
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2.3_8 |
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3.4E7_8 |
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-.25D0_2 |
2 is not a valid kind for reals. |
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+2.7182812846182 |
No D exponent designator is present; this is a valid single-precision constant. |
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123456789.D400 |
Too large for any double-precision format. |
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123456789.D-400 |
Too small for any double-precision format. |
Compiler Reference ... Data and I/O section: Data Representation