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float
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tfloat4.nim

tfloat4.nim 2.0 KB
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  1. discard """
    2. 

  2.   output: "passed all tests."
    3. 

  3. """
    4. 

  4. 

  5. import strutils
    6. 

  6. 

  7. proc c_sprintf(buf, fmt: cstring) {.importc:"sprintf", header: "<stdio.h>", varargs.}
    8. 

  8. 

  9. proc floatToStr(f: float64): string =
    10. 

  10.   var buffer: array[128, char]
    11. 

  11.   c_sprintf(addr buffer, "%.16e", f)
    12. 

  12.   result = ""
    13. 

  13.   for ch in buffer:
    14. 

  14.     if ch == '\0':
    15. 

  15.       return
    16. 

  16.     add(result, ch)
    17. 

  17. 

  18. 

  19. let testFloats = [
    20. 

  20.   "0", "-0", "0.", "0.0", "-0.", "-0.0", "-1", "1", "1.", ".3", "3.3", "-.3", "-99.99",
    21. 

  21.   "1.1e10", "-2e100", "1.234e-10", "1.234e+10",
    22. 

  22.   "-inf", "inf", "+inf",
    23. 

  23.   "3.14159265358979323846264338327950288",
    24. 

  24.   "1.57079632679489661923132169163975144",
    25. 

  25.   "0.785398163397448309615660845819875721",
    26. 

  26.   "1.41421356237309504880168872420969808",
    27. 

  27.   "0.707106781186547524400844362104849039",
    28. 

  28.   "2.71828182845904523536028747135266250",
    29. 

  29.   "0.00097656250000000021684043449710088680149056017398834228515625"
    30. 

  30. ]
    31. 

  31. 

  32. when not defined(windows):
    33. 

  33.   # Windows' sprintf produces niceties like -1.#INF...
    34. 

  34.   for num in testFloats:
    35. 

  35.     doAssert num.parseFloat.floatToStr.parseFloat == num.parseFloat
    36. 

  36. 

  37. doAssert "0".parseFloat == 0.0
    38. 

  38. doAssert "-.1".parseFloat == -0.1
    39. 

  39. doAssert "2.5e1".parseFloat == 25.0
    40. 

  40. doAssert "1e10".parseFloat == 10_000_000_000.0
    41. 

  41. doAssert "0.000_005".parseFloat == 5.000_000e-6
    42. 

  42. doAssert "1.234_567e+2".parseFloat == 123.4567
    43. 

  43. doAssert "1e1_00".parseFloat == "1e100".parseFloat
    44. 

  44. doAssert "3.1415926535897932384626433".parseFloat ==
    45. 

  45.        3.1415926535897932384626433
    46. 

  46. doAssert "2.71828182845904523536028747".parseFloat ==
    47. 

  47.        2.71828182845904523536028747
    48. 

  48. doAssert 0.00097656250000000021684043449710088680149056017398834228515625 ==
    49. 

  49.      "0.00097656250000000021684043449710088680149056017398834228515625".parseFloat
    50. 

  50. doAssert 0.00998333 == ".00998333".parseFloat
    51. 

  51. doAssert 0.00128333 == ".00128333".parseFloat
    52. 

  52. doAssert 999999999999999.0 == "999999999999999.0".parseFloat
    53. 

  53. doAssert 9999999999999999.0 == "9999999999999999.0".parseFloat
    54. 

  54. doAssert 0.999999999999999 == ".999999999999999".parseFloat
    55. 

  55. doAssert 0.9999999999999999 == ".9999999999999999".parseFloat
    56. 

  56. 

  57. echo("passed all tests.")
    58. 

  58.