in C# this works

  // Declare second integer, double, and String variables.
    int secondInteger;
    double secondDouble; 
    string secondText;

    // Read and save an integer, double, and String to your variables.
     secondInteger = int.Parse(Console.ReadLine());
     secondDouble = double.Parse(Console.ReadLine());
     secondText = Console.ReadLine();

    // Print the sum of both integer variables on a new line.
    Console.WriteLine(secondInteger+i);

    // Print the sum of the double variables on a new line.
    double var3 = secondDouble+d;
     Console.WriteLine(var3.ToString("F1"));

    // Concatenate and print the String variables on a new line
    // The 's' variable above should be printed first.
    Console.WriteLine(s+""+secondText);


}