Scala中实现和Python一致的整数除法和整数求余，Python中实现和Scala一致的整数除法和整数求余

\[\color{black}{\text{In scala, it's weird to imitate/mimic `%` `//` of python, and vice versa.}} \]

Scala中实现和Python一致的整数除法和整数求余

/*
Python's % operator returns a result with the same sign as the divisor, and // rounds towards negative infinity.

In Scala, % and / don't behave the same way. The % operator returns a result with the same sign as the dividend, and / performs truncating division, rounding towards zero.
*/


def pythonMod(a: Int, b: Int): Int = ((a % b) + b) % b

def pythonDiv(a: Int, b: Int): Int = {
  if ((a > 0 && b > 0) || (a < 0 && b < 0)) a / b
  else if (a % b == 0) a / b
  else a / b - 1
}

Python中实现和Scala一致的整数除法和整数求余

def scala_div(x, y):
    if y == 0:
        raise ZeroDivisionError('division by zero')
    elif (x < 0 and y < 0) or (x > 0 and y > 0):
        return abs(x) // abs(y)
    else:
        return -(abs(x) // abs(y))
        
def scala_mod(x, y):
    if y == 0:
        raise ZeroDivisionError('modulo by zero')
    elif x < 0:
        return -(abs(x) % abs(y))
    else:
        return x % abs(y)