Problem with cin

[Arnau]

Hi, I was trying to make a program that calculates the arithmetic average of all the inputed numbers. The program works but there's one problem. I don't know how to tell the program to output the result because there are no more inputed numbers. Any ideas ?

#include <iostream>
using namespace std;
int main () {
  
  cout.setf(ios::fixed);
  cout.precision(2);
  double n;
  double suma = 0;
  int d = 0 ;
  double mitjana;
  
  while (cin>>n) {
      suma= suma + n;
    ++d;
}
  mitjana = suma/d;
  cout << mitjana << endl;
}
    

[MiiNiPaa]

Choose one:
1) Manually send end of stream by pressing Ctrl+D (Linux) or Ctrl+Z (Windows)
2) Enter a non-number
3) select a number to act as sntiel and stop input when it is entered

[Arnau]

Thanks for your reply!
I already noticed that when I entered a non number I obtained the output. But what I was trying to say ( sorry I didn't express myself clearly in the last post) is if there's any way that if I input in a single line a bunch of numbers separated by a space, example: 23 65 78 23 , when I press return the program gives me the output.

[MiiNiPaa]

Yes: use stringstream and getline:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

#include <iostream> #include <iomanip> #include <sstream> #include <string> int main() { std::cout << std::fixed << std::setprecision(2); std::string line; std::getline(std::cin, line); std::istringstream input(line); double sum = 0; int num = 0; double n; while(input >> n) { sum += n; ++num; } double avg = sum/num; std::cout << avg << '\n'; }

Input: 2 4.5 7 3 //should not be included in calculations Output: 4.50

http://ideone.com/3NXnk4