Haskell中`mod`和`rem`的区别 [英] Difference between `mod` and `rem` in Haskell
本文介绍了Haskell中`mod`和`rem`的区别的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
Haskell中 mod 和 rem 之间的区别究竟是什么？
What exactly is the difference between mod and rem in Haskell?
两者似乎都有相同的结果
Both seems to give the same results
*Main> mod 2 3
2
*Main> rem 2 3
2
*Main> mod 10 5
0
*Main> rem 10 5
0
*Main> mod 1 0
*** Exception: divide by zero
*Main> rem 1 0
*** Exception: divide by zero
*Main> mod 1 (-1)
0
*Main> rem 1 (-1)
0
推荐答案
当第二个参数是负数时它们不一样：
They're not the same when the second argument is negative:
2 `mod` (-3) == -1
2 `rem` (-3) == 2
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