div_t div(int numer, int denom);
div computes numer / denom and numer % denom in a single operation.
div returns a structure of type div_t comprising both the quotient and the remainder. The structures contain the members quot (the quotient) and rem (the remainder), each of which has the same type as the arguments numer and denom. If either part of the result cannot be represented, the behavior is undefined.