From dc20371a45791f4e3cba7196cfa3bf1ec805cbdb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Wed, 2 Oct 2019 12:04:11 +0200
Subject: [PATCH] [poincare] PrintInt: std::log10 can introduce precision
 error. Use IEEE754<double>::exponentBase10 instead

---
 poincare/src/print_int.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/poincare/src/print_int.cpp b/poincare/src/print_int.cpp
index c0e89f596..7e819fe77 100644
--- a/poincare/src/print_int.cpp
+++ b/poincare/src/print_int.cpp
@@ -1,11 +1,12 @@
 #include <poincare/print_int.h>
+#include <poincare/ieee754.h>
 #include <assert.h>
 #include <cmath>
 
 namespace Poincare {
 
 int PrintIntInBuffer(uint32_t integer, char * buffer, int bufferLength, bool left) {
-  int wantedLength = integer == 0 ? 1 : std::log10(integer*1.0)+1;
+  int wantedLength = IEEE754<double>::exponentBase10((double)integer) + 1;
   assert(wantedLength > 0);
   if (bufferLength == 0 || wantedLength > bufferLength) {
     return wantedLength;