From ed7953d8f20d2705a430d0e3a4833d49f42be4c8 Mon Sep 17 00:00:00 2001
From: Paul <paulxicao7@gmail.com>
Date: Sun, 26 Oct 2025 14:35:18 +0100
Subject: [PATCH 1/3] check explicitly for zero components for absolute value

---
 src/lib.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 661b67b..816832e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1238,12 +1238,16 @@ impl<T: Clone + Num> One for Complex<T> {
 
 macro_rules! write_complex {
     ($f:ident, $t:expr, $prefix:expr, $re:expr, $im:expr, $T:ident) => {{
-        let abs_re = if $re < Zero::zero() {
+        let abs_re = if $re.is_zero() {
+            $T::zero()
+        } else if $re < Zero::zero() {
             $T::zero() - $re.clone()
         } else {
             $re.clone()
         };
-        let abs_im = if $im < Zero::zero() {
+        let abs_im = if $im.is_zero() {
+            $T::zero()
+        } else if $im < Zero::zero() {
             $T::zero() - $im.clone()
         } else {
             $im.clone()

From 05e45e39d623f356a927fab827522b6897af035e Mon Sep 17 00:00:00 2001
From: Paul <paulxicao7@gmail.com>
Date: Sun, 26 Oct 2025 14:36:01 +0100
Subject: [PATCH 2/3] DRY cleanup via lambda

---
 src/lib.rs | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 816832e..b6bf029 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1238,20 +1238,17 @@ impl<T: Clone + Num> One for Complex<T> {
 
 macro_rules! write_complex {
     ($f:ident, $t:expr, $prefix:expr, $re:expr, $im:expr, $T:ident) => {{
-        let abs_re = if $re.is_zero() {
-            $T::zero()
-        } else if $re < Zero::zero() {
-            $T::zero() - $re.clone()
-        } else {
-            $re.clone()
-        };
-        let abs_im = if $im.is_zero() {
-            $T::zero()
-        } else if $im < Zero::zero() {
-            $T::zero() - $im.clone()
-        } else {
-            $im.clone()
+        let abs = |x: &$T| {
+            if x.is_zero() {
+                $T::zero()
+            } else if *x < Zero::zero() {
+                $T::zero() - x.clone()
+            } else {
+                x.clone()
+            }
         };
+        let abs_re = abs(&$re);
+        let abs_im = abs(&$im);
 
         return if let Some(prec) = $f.precision() {
             fmt_re_im(

From c17e74dc8da5ccde22d2cb433c76943ffa79da47 Mon Sep 17 00:00:00 2001
From: Paul <paulxicao7@gmail.com>
Date: Sun, 26 Oct 2025 21:54:14 +0100
Subject: [PATCH 3/3] add tests

---
 src/lib.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index b6bf029..8b12e97 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2716,6 +2716,14 @@ pub(crate) mod test {
         assert_eq!(format!("{}", c), "-10-10000i");
         #[cfg(feature = "std")]
         assert_eq!(format!("{:16}", c), "      -10-10000i");
+
+        for re in [-0.0, 0.0] {
+            for im in [-0.0, 0.0] {
+                let d = Complex::new(re, im);
+                assert_eq!(format!("{}", d), "0+0i");
+                assert_eq!(format!("{:+}", d), "+0+0i");
+            }
+        }
     }
 
     #[test]