This variant is almost never used in computations , except in situations where one wants to avoid rounding 0.5 or − 0.5 to zero ; or to avoid increasing the scale of floating point numbers , which have a limited exponent range .
This variant is almost never used in most computations , except in situations where one wants to avoid rounding 0.5 or − 0.5 to zero , or to avoid increasing the scale of numbers represented as floating point ( with limited ranges for the scaling exponent ) , so that a non infinite number would round to infinite , or that a small denormal value would round to a normal non-zero value ( these could occur with the round half to even mode ) .