count true value in a vector : count « STL Algorithms Non modifying sequence operations « C++ Tutorial

1. C++ Tutorial
2. STL Algorithms Non modifying sequence operations
3. count

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

int main()
{
  vector<bool> v;
  unsigned int i;

  for(i=0; i < 10; i++) {
   if(rand()  2) v.push_back(true);
   else v.push_back(false);
  }

  cout << "Sequence:\n";
  for(i=0; i<v.size(); i++)
    cout << boolalpha << v[i] << " ";
  cout << endl;

  i = count(v.begin(), v.end(), true);
  cout << i << " elements are true.\n";

  return 0;
}

Sequence:
true true false false true false false false false false
3 elements are true.