Saaa wrote:
> I thought my previous precision question was so retarded it didn't need any
> explanation; anybody here could easily tell me my fault in reasoning.
>
> Here is my question again but this time with examples.
>
> Is there some formatting which lets me print out a floating point in full
> precision?
>
Here's an incredibly simple hack.
import std.stdio, std.string;
string ftoaFull(float f) {
if (f < 0) return "-" ~ ftoaFull(-f);
auto start = f;
auto res = toString(cast(int) f) ~ ".";
while (true) {
f -= cast(int) f;
f *= 10;
res ~= "0123456789"[cast(int) f];
// The critical step
if (cast(float) res.atof() == start) return res;
}
}
void main() {
writefln(ftoaFull(0f));
writefln(ftoaFull(-5.234));
writefln(ftoaFull(1f / 3f)); // problematic
}
Output:
0.0
-5.234
0.33333334
And there you have it.
