A more generic function to compute the mean - C++ template

C++ examples for template:template function

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Description

A more generic function to compute the mean

Demo Code

#include <stdexcept>
#include <iostream>
#include <iterator>

using namespace std;

template<class Value_T, class Iter_T>
Value_T computeMean(Iter_T first, Iter_T last) {
  if (first == last) 
     throw domain_error("mean is undefined");
  Value_T sum;//from  w  w w  . ja  v a2  s  .  com

  int cnt = 0;

  while (first != last) {
    sum += *first++;
    ++cnt;
  }

  return sum / cnt;
}

int main() {
  cout << "please type in several integers separated by newlines" << endl;
  cout << "and terminated by an EOF character (i.e., Ctrl-Z)" << endl;
  double mean = computeMean<double>(istream_iterator<int>(cin),istream_iterator<int>());
  cout << "the mean is " << mean << endl;
}

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