ref: ce5b6036f04ca6af1cb1fe2992c86eb6ad47cf22
dir: /sys/src/ape/lib/ap/gen/div.c/
#include <stdlib.h>
div_t div(int numer, int denom)
{
	div_t ans;
	ans.quot=numer/denom;  /* assumes division truncates */
	ans.rem=numer-ans.quot*denom;
	return ans;
}