Erroneous fixed-precision formatting for long double

[inicula]

Code:

#include <fmt/core.h>
#include <sstream>

int main()
{
        const char *str = "0.000000001";
        std::stringstream ss(str);

        long double x;
        ss >> x;

        fmt::print("{:.1f}\n", x); // 0.000000001
}

Godbolt: https://godbolt.org/z/16TWs8c8M

[vitaut]

Good catch, this should be 0.0.

[vitaut]

Fixed in 388bc29. Thanks for reporting!

[ToppDev]

This does not seemed fixed

#include <fmt/format.h>
#include <format>
#include <iostream>

int main(void) {
  long double val = 0.0000000000000071054273576010018587L;

  fmt::println("fmt: {:13.7f}", val);
  std::cout << std::format("std: {:13.7f}\n\n", val);
}

Output

fmt:     0.0000001
std:     0.0000000

https://compiler-explorer.com/z/57Tbj3rjx

Can you reopen the issue please

[vitaut]

Good catch, thanks @ToppDev. Fixed in 06311ed.