Generics in C++

A sample program was written by my friend Tom to demonstrate generics concepts in C++. Thank you for sharing your code Tom.

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Program Listing

#include <iostream>
#include <iomanip>
#include <vector>

using namespace std;

template<class ReturnType, class Iter>
ReturnType average(Iter first, Iter last)
   ReturnType sum = ReturnType();
   size_t count = 0;

   while (first != last)
     sum += *first;
   return sum / count;

int main()
   vector<int> numbers = { 3, 5, 2, 4, 7, 2, 2 };
   float avg1 = average<float>(numbers.begin(), numbers.end());
   cout << setprecision(10) << "Avg<float> = " << avg1 << '\n';

   double avg2 = average<double>(numbers.begin(), numbers.end());
   cout << setprecision(10) << "Avg2<double> = " << avg2 << '\n';

   long double avg3 = average<long double>(numbers.begin(), numbers.end());
   cout << setprecision(10) << "Avg3<long double> = " << avg3 << '\n';