CHAPTER 9 : Data Usage
PART 4 : USAGE
CHAPTER 9 : Data Usage
9.1 Declarations
9.2 Using floating point numbers
9.3 Using 'typedef'
9.4 Using global data
9.5 Using Structures
9.6 Using Unions
9.7 Using Arrays
9.8 Using Pointers
9.9 Using bit structures
9.10 Using Constants
9.11 Using 'static' declarations
9.12 Initializing variables
9.13 Summary
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9.13 Summary
- Be consistent with declaration style.
- Decide whether to define data within
inner blocks.
- Use floating point numbers only where
necessary.
- Do not compare floating point numbers
for equality.
- typedef major variable types, but not
all variables.
- typedef common sizes of number
variable, including BOOL.
- Use typedef rather than #define or
struct Tag.
- Minimize use of global data. Hide it,
and pass pointers or call operator functions which insulate it.
- For global data files, use header files
to describe the data.
- Keep structures functionally cohesive.
- Avoid large structures - nest them
instead.
- Minimize use of unions.
- Arrays give more information than
pointers.
- Use arrays of pointers rather than
sparse multi-dimensional arrays.
- Use NULL with the null pointer.
- Only reallocate pointers to the same
type or to void *.
- Minimize the use of bit structures.
- Always #define magic numbers, except
basic use of 0 and 1.
- #define bit constants as hexadecimal,
using lowercase x and showing all bits.
- Beware of operations with constants
going out of range.
- Use capital L for long.
- Use quoted characters for character
constants, but never quote more than one character (or hex for non-printing).
- Compare boolean expressions with FALSE.
- Use sizeof, rather than a constant.
- Use enum, rather than #define, unless
wide portability is essential.
- Define rules for initializing
variables.
- Explicitly initialize static data.
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