1 files changed, 2 insertions, 2 deletions
diff --git a/Help/guide/tutorial/Step11/tutorial.cxx b/Help/guide/tutorial/Step11/tutorial.cxx
index 6acafd2..a4f44d5 100644
--- a/Help/guide/tutorial/Step11/tutorial.cxx
+++ b/Help/guide/tutorial/Step11/tutorial.cxx
@@ -1,5 +1,4 @@
 // A simple program that computes the square root of a number
-#include <cmath>
 #include <iostream>
 #include <string>
 
@@ -16,7 +15,8 @@ int main(int argc, char* argv[])
     return 1;
   }
 
-  double inputValue = std::stod(argv[1]);
+  // convert input to double
+  const double inputValue = std::stod(argv[1]);
 
   const double outputValue = mathfunctions::sqrt(inputValue);