From 9d6b2e3cad1d962266c3521486caaa76de8d9e8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Mon, 29 Jan 2018 12:24:06 +0100
Subject: [PATCH] [apps] Calculation: add a method to test if the exact output
 and the approximate output are equal

---
 apps/calculation/calculation.cpp | 10 ++++++++++
 apps/calculation/calculation.h   |  1 +
 2 files changed, 11 insertions(+)

diff --git a/apps/calculation/calculation.cpp b/apps/calculation/calculation.cpp
index 53f7ac877..cfd7854ff 100644
--- a/apps/calculation/calculation.cpp
+++ b/apps/calculation/calculation.cpp
@@ -192,4 +192,14 @@ bool Calculation::shouldDisplayApproximateOutput(Context * context) {
   return input()->isApproximate(*context);
 }
 
+bool Calculation::exactAndApproximateOutputsAreEqual(Poincare::Context * context) {
+  if (exactOutput(context)->type() != Expression::Type::Rational) {
+    return false;
+  }
+  Expression * approximateOutput = Expression::ParseAndSimplify(m_approximateOutputText, *context);
+  bool isEqual = approximateOutput->isIdenticalTo(exactOutput(context));
+  delete approximateOutput;
+  return isEqual;
+}
+
 }
diff --git a/apps/calculation/calculation.h b/apps/calculation/calculation.h
index e926241b3..ce28f55d3 100644
--- a/apps/calculation/calculation.h
+++ b/apps/calculation/calculation.h
@@ -31,6 +31,7 @@ public:
   bool isEmpty();
   void tidy();
   bool shouldDisplayApproximateOutput(Poincare::Context * context);
+  bool exactAndApproximateOutputsAreEqual(Poincare::Context * context);
   constexpr static int k_printedExpressionSize = 2*::TextField::maxBufferSize();
 private:
   /* Buffers holding text expressions have to be longer than the text written