Rounding integer division (instead of truncating)

Question

I was curious to know how I can round a number to the nearest whole number. For instance, if I had:

int a = 59 / 4;

which would be 14.75 if calculated in floating point; how can I store the result as 15 in "a"?

Answer 1

The standard idiom for integer rounding up is:

int a = (59 + (4 - 1)) / 4;

You add the divisor minus one to the dividend.