text: #include <iostream>
  #include <iomanip>
  #include <limits>
  
  using namespace std;
  
  int main() 
  {
      int i = 4;
      double d = 4.0;
      string s = "HackerRank ";
  
      // Declare second integer, double, and String variables.
      int secondInteger = NULL;
      double secondDouble = NULL;
      string secondString = "";
      
      
      cin >> secondInteger;
      cin >> secondDouble;
      cin.ignore(); // Ignore the newline character
      getline(cin, secondString);
  
      // Print the sum of both integer variables on a new line.
      cout << i + secondInteger << endl;
      
      // Print the sum of the double variables on a new line.
      cout << fixed << setprecision(1) << d + secondDouble << endl;
      
      // Concatenate and print the String variables on a new line
      cout << s << secondString << endl;
  
      return 0;
  }