From 43a123c1ae6613b3efeed291fa552ecd909d3acf Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:23:18 +0200 Subject: Adding upstream version 1.20.14. Signed-off-by: Daniel Baumann --- src/strconv/ctoa.go | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 src/strconv/ctoa.go (limited to 'src/strconv/ctoa.go') diff --git a/src/strconv/ctoa.go b/src/strconv/ctoa.go new file mode 100644 index 0000000..c16a2e5 --- /dev/null +++ b/src/strconv/ctoa.go @@ -0,0 +1,27 @@ +// Copyright 2020 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package strconv + +// FormatComplex converts the complex number c to a string of the +// form (a+bi) where a and b are the real and imaginary parts, +// formatted according to the format fmt and precision prec. +// +// The format fmt and precision prec have the same meaning as in FormatFloat. +// It rounds the result assuming that the original was obtained from a complex +// value of bitSize bits, which must be 64 for complex64 and 128 for complex128. +func FormatComplex(c complex128, fmt byte, prec, bitSize int) string { + if bitSize != 64 && bitSize != 128 { + panic("invalid bitSize") + } + bitSize >>= 1 // complex64 uses float32 internally + + // Check if imaginary part has a sign. If not, add one. + im := FormatFloat(imag(c), fmt, prec, bitSize) + if im[0] != '+' && im[0] != '-' { + im = "+" + im + } + + return "(" + FormatFloat(real(c), fmt, prec, bitSize) + im + "i)" +} -- cgit v1.2.3