Re: Write double to text file, then read it back later without losing precision

[bearophile via Digitalmars-d-learn]

Andrew Brown:

I would like to write a double to a text file as hexadecimal and then read it back in without losing information.

Is this good enough for you?

void main() {
    import std.stdio, std.math;

    auto fout = File("ouput.txt", "w");
    fout.writef("%a", PI);
    fout.close;

    auto fin = File("ouput.txt");
    real r;
    fin.readf("%f", &r);
    fin.close;
    assert(PI == r);
}

Bye,
bearophile