• via Digitalmars-d-bugs (26/26) Aug 24 2015 https://issues.dlang.org/show_bug.cgi?id=14958

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=14958

          Issue ID: 14958
           Summary: Casting a double to ulong sometimes produces wrong
                    results
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: critical
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: marcioapm gmail.com

import std.stdio;
void main() {
  double x = 1.2;
  writeln(cast(ulong)(x * 10.0));
  double y = 1.2 * 10.0;
  writeln(cast(ulong)y);
}

Output:
11
12


to!ulong instead of the cast does the right thing, and is a viable work-around.

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