Question

I want to write doubles to a file but the string cast reduces the precision.
Edit : I don’t really cast but put the doubles in an ostringstream.

Is there another way than parsing each digit using modulo and division to write the doubles with more precision ?

Edit : My application needs to be portable

Here is my current code :

std::string arraytocsv(double v[], int size) {  
    std::ostringstream oss;
    for (int i = 0; i < size; i++) {
        oss << v[i] << ";";
    }
    oss << std::endl;
    return oss.str();
}

I’ve had the precision() function, it works. Thanks

Answer 1

You can use precision function.