Create a sequence that contains the midpoints between the values in two other sequences.

  
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

double reciprocal(double val);

template<class T> void show(const char *msg, vector<T> vect);

int main(){
  int i;

  vector<double> v;

  for(i=1; i < 10; ++i) 
     v.push_back((double)i);

  show("Initial contents of v:", v);
  cout << endl;

  vector<double> v2(10);
  transform(v.begin(), v.end(), v2.begin(), reciprocal);

  show("v2:", v2);

  return 0;
}
template<class T> void show(const char *msg, vector<T> vect) {
  cout << msg << endl;
  for(unsigned i=0; i < vect.size(); ++i)
    cout << vect[i] << endl;
}

// Return the reciprocal
double reciprocal(double val) {
  if(val == 0.0) 
     return 0.0;
  return 1.0 / val; 
}

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Create a sequence that contains the midpoints between the values in two other sequences. : transform « STL Algorithms Modifying sequence operations « C++

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