| ??? 01/29/08 15:24 Read: times |
#150062 - Know Thy Stuff - enum Responding to: ???'s previous message |
Neil Kurzman said:
I think enum behaves as a signed int. But the compiler may use 8 bits if the enum sequence will fit Brett Wallace said:
I think the only reqiurement on the type of an enum is it must fit the value. I think most compilers will use the smallest size that works for the value entered... OK, here's chapter & verse: ISO/IEC 9899:1990, section 6.5.2.2, said:
Constraints
The expression that defines the value of an enumeration constant shall be an integral constant expression that has a value representable as int. Semantics The identifiers in an enumerator list are declared as constants that have type int ISO/IEC 9899:1990, section 6.1.3.3, said:
Semantics
An identifier declared as an enumeration constant has type int ISO/IEC 9899:1990, section 6.1.2.3, said:
Types
There are four signed integer types, designated as signed char, short int, int, and long int. Thus enum constants are ints, and ints are implicitly signed. Having said that, it is true that many compilers do have options to control the type(s) used for enums... |
| Topic | Author | Date |
| The art of typecasting | 01/01/70 00:00 | |
| I'd like to disagree | 01/01/70 00:00 | |
| two comments | 01/01/70 00:00 | |
| Two comments on comments | 01/01/70 00:00 | |
| The Art of correct Constants | 01/01/70 00:00 | |
| int - number of bits unknown | 01/01/70 00:00 | |
| Corrected Art of correct Constants | 01/01/70 00:00 | |
| More assumptions | 01/01/70 00:00 | |
| stdint.h | 01/01/70 00:00 | |
| Or, in the absence of stdint.h... | 01/01/70 00:00 | |
| Const vs #define | 01/01/70 00:00 | |
| Opps! | 01/01/70 00:00 | |
| which may be a reason to prefer #define over const | 01/01/70 00:00 | |
| enum | 01/01/70 00:00 | |
| Varies | 01/01/70 00:00 | |
| Know Thy Stuff - enum | 01/01/70 00:00 | |
| You are right | 01/01/70 00:00 | |
| Know Thy Stuff | 01/01/70 00:00 | |
| And... | 01/01/70 00:00 | |
| I'll pass(cal) on that one :) | 01/01/70 00:00 | |
| Everything in C defaults to int, which is signed | 01/01/70 00:00 | |
| Never overlook lint | 01/01/70 00:00 | |
| before Steve says it... | 01/01/70 00:00 | |
| Pascal | 01/01/70 00:00 | |
| strong typing | 01/01/70 00:00 | |
| why Ada never took off | 01/01/70 00:00 | |
| Wirth-less | 01/01/70 00:00 | |
Why ? | 01/01/70 00:00 |