From db822918917c96f31067249dc915fd4a5936b069 Mon Sep 17 00:00:00 2001
From: David Mak <csdavidmak@ust.hk>
Date: Mon, 9 Oct 2023 16:02:15 +0800
Subject: [PATCH] standalone: Do not output sign if float is NaN

Matches behavior in Python.
---
 nac3standalone/demo/demo.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/nac3standalone/demo/demo.c b/nac3standalone/demo/demo.c
index fb112d8..ef80b74 100644
--- a/nac3standalone/demo/demo.c
+++ b/nac3standalone/demo/demo.c
@@ -1,3 +1,4 @@
+#include <math.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -33,7 +34,11 @@ void output_uint64(uint64_t x) {
 }
 
 void output_float64(double x) {
-  printf("%f\n", x);
+  if (isnan(x)) {
+    puts("nan");
+  } else {
+    printf("%f\n", x);
+  }
 }
 
 void output_asciiart(int32_t x) {