1 files changed, 6 insertions, 3 deletions
diff --git a/src/displayapp/screens/Calculator.cpp b/src/displayapp/screens/Calculator.cpp
index e1f36f6..e05aedd 100644
--- a/src/displayapp/screens/Calculator.cpp
+++ b/src/displayapp/screens/Calculator.cpp
@@ -204,7 +204,8 @@ bool Calculator::Eval() {
                    // or (the operator at the top of the operator stack has equal precedence and the token is left associative))
                    || (getPrecedence(operators.top()) == getPrecedence(next) && leftAssociative(next)))) {
           // need two elements on the output stack to add a binary operator
-          if (!output.pushOperator(operators.pop())) return false;
+          if (!output.pushOperator(operators.top())) return false;
+          operators.pop();
         }
         operators.push(next);
         expectingNumber = true;
@@ -229,7 +230,8 @@ bool Calculator::Eval() {
       case ')':
         while (operators.top() != '(') {
           // need two elements on the output stack to add a binary operator
-          if (!output.pushOperator(operators.pop())) return false;
+          if (!output.pushOperator(operators.top())) return false;
+          operators.pop();
           if (operators.empty()) return false;
         }
         // discard the left parentheses
@@ -237,7 +239,8 @@ bool Calculator::Eval() {
     }
   }
   while (!operators.empty()) {
-    output.pushOperator(operators.pop());
+    if (!output.pushOperator(operators.top())) return false;
+    operators.pop();
   }
   // perform the calculation
   // assert(output.size() == 1);