casting double to unsigned int

[akmalnuernberg]

hi guys,

how do i use casting for a double type number to correctly change into unsigned int type number

for example:

double dbl = 7.9992;
unsigned int UInt = (unsigned int)dbl;

here i want UInt to be 8 instead of 7, which is the case right now. how do i do that without to use my own function?

[bnbertha]

The only way I've seen to do it is to add 0.5 before casting. Also, if you're in C++ rather than C, you'd be better using static_cast. So your code would look like this:

double dbl = 7.9992;
unsigned int UInt = static_cast<unsigned int>(dbl + 0.5);

[akmalnuernberg]

thanks bnbertha for the quick reply. now i remember a bit. by adding 0.5, then floor rounding is always mathematically correct to the original ones, am i right? this must be caused of lacks of practices. thanks bnbertha!
thanks for the tips about static_cast too!

[bnbertha]

Yes, then flooring works for you.

No problem