Rounding off a positive number to the next nearest multiple of 5

Question

I need to round of a number (the input is guaranteed to be an integer & is positive) to the next multiple of 5.

I tried this:

int round = ((grade         


        

Answer 1

To round up the general form should be:

((n + denominator -1) / denominator )* denominator 

so in your case:

int round = ((grades[j] + 4)/5) * 5;

The reason we deduct 1 from the denominator is to handle exact multiples of the rounding value for instance:

((70 + 4) / 5) * 5

would yield 70