MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

Implementation-Defined Behavior
The following table describes the amount of storage and range of various types of
floating point numbers: (ISO 6.1.2.5)
What is the direction of truncation, when an integral number is converted to a
floating-point number, that cannot exactly represent the original value? (ISO 6.2.1.3)
Down.
What is the direction of truncation, or rounding, when a floating-point number is
converted to a narrower floating-point number? (ISO 6.2.1.4)
Down.
A.9 ARRAYS AND POINTERS
A.10 REGISTERS
TABLE A-3: FLOATING-POINT TYPES
Designation Size (bits) Range
float 32 1.175494e-38 … 3.40282346e+38
double* 32 1.175494e-38 … 3.40282346e+38
long double 64 2.22507385e-308 … 1.79769313e+308
* double is equivalent to long double if -fno-short-double is used.
Implementation-Defined Behavior for Arrays and Pointers is covered in section G.3.7
of the ANSI C Standard.
What is the type of the integer required to hold the maximum size of an array that is,
the type of the size of operator, size_t? (ISO 6.3.3.4, ISO 7.1.1)
unsigned int.
What is the size of integer required for a pointer to be converted to an integral type?
(ISO 6.3.4)
16 bits.
What is the result of casting a pointer to an integer, or vice versa? (ISO 6.3.4)
The mapping is the identity function.
What is the type of the integer required to hold the difference between two pointers to
members of the same array, ptrdiff_t? (ISO 6.3.6, ISO 7.1.1)
unsigned int.
Implementation-Defined Behavior for Registers is covered in section G.3.8 of the ANSI
C Standard.
To what extent does the storage class specifier register actually effect the storage
of objects in registers? (ISO 6.5.1)
If optimization is disabled, an attempt will be made to honor the register storage
class; otherwise, it is ignored.
© 2008 Microchip Technology Inc. DS51284H-page 133