Demonstrate count and count_if.


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

bool even(int x) 
{
  return !(x%2);
}

int main()
{
  vector<int> vectorObject; 
  int i;


  for(i = 0; i <20; i++) {
    if(i%2) vectorObject.push_back(1);
    else vectorObject.push_back(2);
  }

  cout << "Sequence: ";
  for(i = 0; i <vectorObject.size(); i++) 
     cout << vectorObject[ i ] << " ";
  cout << endl;

  int n;
  n = count(vectorObject.begin(), vectorObject.end(), 1);
  cout << n << " elements are 1\n";

  n = count_if(vectorObject.begin(), vectorObject.end(), even);
  cout << n << " elements are even.\n";

  return 0;
}

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Demonstrate count and count_if. : Vector « Data Structure « C++

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