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  1. def binaryDivision(int a, int b) {
  2.     int result = 0
  3.     int sign = 0
  4.     if (a < 0) {
  5.         sign = sign + 1
  6.         a = 0 - a
  7.     }
  8.     if (b < 0) {
  9.         sign = sign - 1
  10.         b = 0 - b
  11.     }
  12.  
  13.     int limit = a >> 1
  14.     if (limit < (1 << 30)) limit = 1 << 30
  15.     int origB = b
  16.     while (b < limit) {
  17.         b = b << 1
  18.     }
  19.     while (b >= origB) {
  20.         result = result << 1
  21.         if (a >= b) {
  22.             a = a - b
  23.             result = result + 1
  24.         }
  25.         b = b >> 1
  26.     }
  27.  
  28.     if (sign != 0) result = 0 - result
  29.     return result
  30. }
  31.  
  32. 100000.times {
  33.     def RNG = new Random()
  34.     int a = RNG.nextInt()
  35.     int b = RNG.nextInt()
  36.     int expected = a/b
  37.     //println "$a $b"
  38.     assert binaryDivision(a, b) == expected
  39. }
  40.  
  41. int divBy10(int x) {
  42.     int result = 214748364
  43.     for (int i = 32; i > 0; i = i - 1) {
  44.         if (x & 1) {
  45.             //Integer.parseInt('00011001100110011001100110011001', 2)
  46.             result = result + 429496729
  47.         }
  48.         x = x >> 1
  49.         result = result >> 1
  50.     }
  51.     return result
  52. }
  53.  
  54. 100000.times {
  55.     assert divBy10(it) == (it / 10 as int)
  56. }
  57.  
Success #stdin #stdout 2.64s 333376KB
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https://ideone.com/eP5AHR
language:
Groovy (groovy 2.5.6)
created:
9 years ago
visibility:
public

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