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Merge pull request #4216 from Parashurama/fix_4212

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fixes issue 4212 && add test for various valid zero floats.
This commit is contained in:
Andreas Rumpf
2016-05-25 17:11:57 +02:00
parent 2bc6acd0ed 4716034a7f
commit ea0dff3783
2 changed files with 23 additions and 15 deletions
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4
lib/system/sysstr.nim
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@@ -387,8 +387,8 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
# if has no digits: return error
if kdigits + fdigits <= 0 and
(i == start or # was only zero
has_sign) : # or only '+' or '-
(i == start or # no char consumed (empty string).
(i == start + 1 and has_sign)): # or only '+' or '-
return 0
if s[i] in {'e', 'E'}:

34
tests/float/tfloat4.nim
View File

@@ -1,3 +1,8 @@
discard """
file: "tfloat4.nim"
output: "passed all tests."
exitcode: 0
"""
import math, strutils
proc c_sprintf(buf, fmt: cstring) {.importc:"sprintf", header: "<stdio.h>", varargs.}
@@ -11,9 +16,10 @@ proc floatToStr(f: float64): string =
return
add(result, ch)
let testFloats = [
"0", "-1", "1", "1.", ".3", "3.3", "-.3", "-99.99",
"1.1e10", "-2e100", "1.234e-10", "1.234e+10", "-0.0",
"0", "-0", "0.", "0.0", "-0.", "-0.0", "-1", "1", "1.", ".3", "3.3", "-.3", "-99.99",
"1.1e10", "-2e100", "1.234e-10", "1.234e+10",
"-inf", "inf", "+inf",
"3.14159265358979323846264338327950288",
"1.57079632679489661923132169163975144",
@@ -25,18 +31,20 @@ let testFloats = [
]
for num in testFloats:
assert num.parseFloat.floatToStr.parseFloat == num.parseFloat
doAssert num.parseFloat.floatToStr.parseFloat == num.parseFloat
assert "0".parseFloat == 0.0
assert "-.1".parseFloat == -0.1
assert "2.5e1".parseFloat == 25.0
assert "1e10".parseFloat == 10_000_000_000.0
assert "0.000_005".parseFloat == 5.000_000e-6
assert "1.234_567e+2".parseFloat == 123.4567
assert "1e1_00".parseFloat == "1e100".parseFloat
assert "3.1415926535897932384626433".parseFloat ==
doAssert "0".parseFloat == 0.0
doAssert "-.1".parseFloat == -0.1
doAssert "2.5e1".parseFloat == 25.0
doAssert "1e10".parseFloat == 10_000_000_000.0
doAssert "0.000_005".parseFloat == 5.000_000e-6
doAssert "1.234_567e+2".parseFloat == 123.4567
doAssert "1e1_00".parseFloat == "1e100".parseFloat
doAssert "3.1415926535897932384626433".parseFloat ==
3.1415926535897932384626433
assert "2.71828182845904523536028747".parseFloat ==
doAssert "2.71828182845904523536028747".parseFloat ==
2.71828182845904523536028747
assert 0.00097656250000000021684043449710088680149056017398834228515625 ==
doAssert 0.00097656250000000021684043449710088680149056017398834228515625 ==
"0.00097656250000000021684043449710088680149056017398834228515625".parseFloat
echo("passed all tests.")