问题
Say I've got
SDL_Rect rect;
rect.x = 5; // rect.x is of type "Uint16"
int y = 11;
and I want to perform the operation rect.x/y.
I want to get the result as a floating point number and then round up to the nearest int.
Something like this:
float result = rect.x/y;
int rounded = ceil(result);
How should I do this?
回答1:
Cast either rect.x or y to float, and then do the division. This will force the entire division operation to take place in floating point.
float result = rect.x/(float)y;
int rounded = ceil(result);
回答2:
You need to cast your variables.
float result = (float)rect.x / (float)y;
int rounded = ceil(result);
回答3:
You can do this without any floating point types. If x and y are positive integers, then x divided by y, rounded up is (x+y-1)/y.
来源：https://stackoverflow.com/questions/13391664/c-integer-division