Python-style integer division & modulus in C

Question

In Python and Ruby, signed integer division truncates towards negative infinity, and signed integer modulus has the same sign the second operand:

>>>         


        

Answer 1

It delves into the ugly world of floats, but these give correct answers in Java:

public static int pythonDiv(int a, int b) {
    if (!((a < 0) ^ (b < 0))) {
        return a / b;
    }
    return (int)(Math.floor((double)a/(double)b));
}

public static int pythonMod(int a, int b) {
    return a - b * pythonDiv(a,b);
}

I make no assertions about their efficiency.