Consider this snippet:

void main()
{
    import std.stdio;
    auto a = 6.2151;
    auto b = a * 10000;
    auto c = cast(ulong)b;
    writeln("a: ", typeof(a).stringof, " ", a);
    writeln("b: ", typeof(b).stringof, " ", b);
    writeln("c: ", typeof(c).stringof, " ", c);

    auto x = 62151.0;
    auto y = cast(ulong)x;
    writeln("x: ", typeof(x).stringof, " ", x);
    writeln("y: ", typeof(y).stringof, " ", y);
}

The output is:
a: double 6.2151
b: double 62151
c: ulong 62150
x: double 62151
y: ulong 62151

Why does c round off from 62151 to 62150 when casting to ulong?

Thanks,
Saurabh

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