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16-Bit Language Tools Libraries
2.6
<FLOAT.H> FLOATING-POINT CHARACTERISTICS
The header file float.h consists of macros that specify various properties of float-
ing-point types. These properties include number of significant figures, size limits, and
what rounding mode is used.
DBL_DIG
Description:
Include:
Value:
Remarks:
Number of decimal digits of precision in a double precision float-
ing-point value
<float.h>
6 by default, 15 if the switch -fno-short-double is used
By default, a double type is the same size as a float type (32-bit repre-
sentation). The -fno-short-double switch allows the IEEE 64-bit
representation to be used for a double precision floating-point value.
DBL_EPSILON
Description:
Include:
Value:
Remarks:
The difference between 1.0 and the next larger representable double
precision floating-point value
<float.h>
1.192093e-07 by default, 2.220446e-16 if the switch
-fno-short-double is used
By default, a double type is the same size as a float type (32-bit repre-
sentation). The -fno-short-double switch allows the IEEE 64-bit
representation to be used for a double precision floating-point value.
DBL_MANT_DIG
Description:
Include:
Value:
Remarks:
Number of base- FLT_RADIX digits in a double precision floating-point
significand
<float.h>
24 by default, 53 if the switch -fno-short-double is used
By default, a double type is the same size as a float type (32-bit repre-
sentation). The -fno-short-double switch allows the IEEE 64-bit
representation to be used for a double precision floating-point value.
DBL_MAX
DS51456E-page 24
Description:
Include:
Value:
Remarks:
Maximum finite double precision floating-point value
<float.h>
3.402823e+38 by default, 1.797693e+308 if the switch
-fno-short-double is used
By default, a double type is the same size as a float type (32-bit repre-
sentation). The -fno-short-double switch allows the IEEE 64-bit
representation to be used for a double precision floating-point value.
? 2008 Microchip Technology Inc.
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