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

16-Bit C Compiler User’s Guide
A.11 STRUCTURES, UNIONS, ENUMERATIONS AND BIT FIELDS
A.12 QUALIFIERS
A.13 DECLARATORS
A.14 STATEMENTS
Implementation-Defined Behavior for Structures, Unions, Enumerations and Bit Fields
is covered in sections A.6.3.9 and G.3.9 of the ANSI C Standard.
What are the results if a member of a union object is accessed using a member of a
different type? (ISO 6.3.2.3)
No conversions are applied.
Describe the padding and alignment of members of structures? (ISO 6.5.2.1)
Chars are byte-aligned. All other objects are word-aligned.
What is the equivalent type for a plain int bit field? (ISO 6.5.2.1)
User defined. By default, signed int bit field. May be made an unsigned int bit
field using a command line option.
What is the order of allocation of bit fields within an int? (ISO 6.5.2.1)
Bits are allocated from least-significant to most-significant.
Can a bit field straddle a storage-unit boundary? (ISO 6.5.2.1)
Yes.
Which integer type has been chosen to represent the values of an enumeration type?
(ISO 6.5.2.2)
int.
Implementation-Defined Behavior for Qualifiers is covered in section G.3.10 of the
ANSI C Standard.
Describe what action constitutes an access to an object that has volatile-qualified type?
(ISO 6.5.3)
If an object is named in an expression, it has been accessed.
Implementation-Defined Behavior for Declarators is covered in section G.3.11 of the
ANSI C Standard.
What is the maximum number of declarators that may modify an arithmetic, structure,
or union type? (ISO 6.5.4)
No limit.
Implementation-Defined Behavior for Statements is covered in section G.3.12 of the
ANSI C Standard.
What is the maximum number of case values in a switch statement? (ISO 6.6.4.2)
No limit.
DS51284H-page 134 © 2008 Microchip Technology Inc.