$ wc -c a.cpp t.cpp 
  399 a.cpp
  380 t.cpp
  779 total
  $ cat t.cpp 
  #include <iostream>
  using namespace std;
  
  namespace utils {
    template<typename T> T square(const T& n) { return n * n; }
  }
  
  int main() {
    int input(0);
    auto message("Please enter a positive number");
  
    cout << message << ":\n";
    cin >> input;
  
    if (input>0) { cout << "Result: " << utils::square(input) << "\n"; }
    else         { cout << message << "\n"; }
  
    return 0;
  }
  $ cat a.cpp 
  #include <iostream>
  using namespace std
  
  namespace utils
      template<typename T>
      auto square(const T& n)
          return n * n
 
  int main()
      auto input = 0
      auto message = "Please enter a positive number"
  
      cout << message << ":" << endl
      cin >> input
  
      if input > 0
          cout << "Result: " << utils::square(10) << endl
      else
          cout << message << endl
      return 0

I am not entirely convinced that t.cpp has any more or less noise than a.cpp and where exactly there is any sort of gain from this – I had more trouble indenting the second piece of code properly for HN than the first.