| ??? 01/28/08 13:38 Read: times |
#150008 - int - number of bits unknown Responding to: ???'s previous message |
Neil Kurzman said:
And an int times an int = int with a 16 X 16 multiply That is assuming that int is a 16 bit signed integer. The 'C' does not explicitily delare the number of bits in any of it's integral data types. That is always compiler and platform dependant issue. An integer (int) may have any number of bits right from 8 up to 64. The same applies to notation with 'U', 'UL', and 'L' as datatype long is usually 32 bit integer but it might also be a 64 bit one - again depending on the platform and the compiler. So the best solution is to use typecasting with derived data types that are declared explicitily for the current compiler/platform and do typecasting with those. A sample: typedef unsigned char uint8_t; // works on all compilers typedef signed char int8_t; // might not work on all compilers typedef unsigned short uint16_t;// Assumes 16 bit short // and so forth ... |
| 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 |