I need to convert the result from my atmega328 ADC to a format where I can display it on a seven segment display. I am using a 5V reference for the ADC (which is 10 bit) so 1 bit = 5/1028=4.89mV . I have to multiply the result form the ADC by this number to get the actual voltage in, but I want the result to be as accurate as possible - I don't want to round up to 5.
What are some ways I can do this? Do i have to use fixed / floating point maths?