Handle more syntax

Author: ckormanyos

code_snippets/chapter12/chapter12_07-001_derivative.cpp

@@ -45,11 +45,11 @@ constexpr auto derivative(ValueType x,
   return ((fifteen_m1 - six_m2) + m3) / ten_dx1;
 }
 
-constexpr float x { static_cast<float>(std::numbers::pi_v<float> / static_cast<float>(3.0L)) };
+constexpr float xval { static_cast<float>(std::numbers::pi_v<float> / static_cast<float>(3.0L)) };
 
 // Should be very near 0.5.
 const auto y =
-  derivative(x,
+  derivative(xval,
              0.01F,
              [](float x) -> float
              {

code_snippets/chapter12/chapter12_07-002_deriv_quadratic.cpp

@@ -59,11 +59,11 @@ class quadratic
   }
 };
 
-constexpr float x { 0.5F };
+constexpr float xval { 0.5F };
 
 // Should be very near 4.6.
 constexpr float y =
-  derivative(x,
+  derivative(xval,
              0.01F,
              quadratic(1.2F, 3.4F, 5.6F));
 
@@ -73,7 +73,7 @@ auto main() -> int
 {
   std::stringstream strm { };
 
-  // 4.6
+  // 4.600001
   strm << std::setprecision(std::numeric_limits<float>::digits10) << std::fixed << y << '\n';
 
   using std::fabs;