Number of base-FLT_RADIX digits in a double precision
floating-point significand.
Include
<float.h>
Value
The value 24.
Remarks
By default, a double type is the same size as a float type (32-bit
representation). The -fno-short-double switch allows the IEEE 64-bit
representation to be used for a double precision floating-point value.
When building for C99,
the double type is the same size and format as the
float type, and is a 32-bit representation.