cs11dotnet7/vscode/Chapter04/Debugging/Program.cs

double a = 4.5;
double b = 2.5;
double answer = Add(a, b);

WriteLine($"{a} + {b} = {answer}");
WriteLine("Press ENTER to end the app.");
ReadLine(); // wait for user to press ENTER

double Add(double a, double b)
{
  return a + b; // deliberate bug!
}