On 3/26/06, Shriramana Sharma <samjnaa@xxxxxxxxx> wrote: > I am trying to work out whether to use an integer or a double for my > internal > storage variable of a class meant to store a time. > > Qt uses an unsigned integer with millisecond being the best precision, but I > am wondering, why I should lose the extra digits of precision that I could > get if I used a double. > > Is there a marked increase in computing speed if integer arithmetic is used > compared to double precision? It depends: every modern average CPU can do floating point arithmetics at least as fast as simple integer arithmetics (sometimes even faster). The emphasis here lies on "can". If the compiler has difficulties generating code for the FPU of a specific target platform it will default to floating point library calls causing real performance penalties. Why do you consider doubles to store time values? \Steve - : send the line "unsubscribe linux-c-programming" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
