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+--- Thread: Integral promotion. (/showthread.php?tid=223)
Integral promotion. - warawut - 01-03-2006
I have some doubt about the integral promotion whether how integral promotion's rule perform with the unsuffixed constant (hexadecimal).
Example:
16bit ECU
0xffff -----> Will it promote to \"int\" or \"unsigned int\"?
0xffffffff -----> Will it promote to \"int\" or \"unsigned int\"?
32bit ECU
0xffff -----> Will it promote to \"int\" or \"unsigned int\"?
0xffffffff -----> Will it promote to \"int\" or \"unsigned int\"?
Who know how does it perform with hexadecimal.
Please kindly give me the answer.
Thanks in advance,
Warawut.
- lv - 01-03-2006
The type of an unsifixed hexadecimal constant is the first of the following list in which its value can be represented:
int
unsigned int
long
unsigned long
then, for 16 bits µC (int=16bits):
0xffff => unsigned int
0xffffffff => unsigned long
and for 32 bits µC (int=32bits):
0xffff => int
0xffffffff => unsigned int
Searching the C(99) Standard - derek_farn - 03-03-2006
Those wanting to search the C Standard, looking for appropriate wording for a problem, might like to use http://c0x.coding-guidelines.com, which as been indexed by Google. Please note that the text is based on C99, not C90.
The wording appropriate to this question can be found in:
http://c0x.coding-guidelines.com/6.3.1.1.html (at least it would be if I had not manged to mangle the formatting of tables; fixed real-soon-now).
Those who regularly use the C Standard + Firefox can make use of the following handy plug-in:
http://mycroft.mozdev.org/download.html?name=coding-guidelines&submitform=Search