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

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C++ Tutorial » STL Algorithms Non modifying sequence operations » count

25.4.1.count true value in a vector

#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.

25.4.count
	25.4.1.	count true value in a vector
	25.4.2.	Use count on string
	25.4.3.	Use count function and print elements with value 4
	25.4.4.	Use count function to count elements with even value
	25.4.5.	Use count function to count elements that are greater than value 4

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