v/vlib/strconv/converter_test.v

module main

fn test_issue_16448() {
	float_prec := 1.9999999999999999 + 0.0000000000000000005
	assert float_prec > 1.99
	assert float_prec < 2.01
}

// Testing all the numbers between -100E6..100E6 takes over a minute with clang on i3
// while for just -1E5..1E5, it takes less than a second.
// const r = i64(100_000_001)
// const r = i64(17_000_001)
const r = i64(100_001)

fn test_renormalisation_inside_converter() {
	for i in -r .. r {
		s := '${i}.9999999999999999999'
		fs := s.f64()
		ifs := i64(fs)
		if i % 10000 == 0 {
			eprintln('>>> s: ${s:30s} | fs: ${fs:20.6f} | ifs: ${ifs:20}')
		}
		if i < 0 && ifs != i - 1 {
			panic('invalid negative  f64 value, i: ${i} | s: ${s} | fs: ${fs} | ifs: ${ifs}')
		}
		if i > 0 && ifs != i + 1 {
			panic('invalid positive  f64 value, i: ${i} | s: ${s} | fs: ${fs} | ifs: ${ifs}')
		}
	}
}