Найти сумму и количество положительных элементов массива

#include <iostream>
using namespace std;
 
int main()
{
    int a[5],sum = 0, count = 0;
    cout << "Enter mas: \n";
    
    for(int i=0;i<5;i++)
    cin >> a[i];
    
    for(int i=0;i<5;i++)
    if(a[i]>0){sum += a[i]; count++;}
    
    cout << "Sum = " << sum << "  Kol-vo = " << count;
    
    cin.get();
    cin.get();
}

#include "stdafx.h"
#include <iostream>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <cstdlib>
 
 
int _tmain(int argc, _TCHAR* argv[])
{
    const int SIZE = 10;
    int arr[SIZE] = { -1, 1, 5, 2, -4, 0, 7, -2, 5, -9 };
    std::cout << "Array:" << std::endl;
    std::copy(arr, arr + SIZE, std::ostream_iterator<int>(std::cout, " "));
    std::cout << std::endl;
    int positives = std::count_if(arr, arr + SIZE, std::bind2nd(std::greater<int>(), 0));
    std::sort(arr, arr + SIZE, std::greater<int>());
    int sum = std::accumulate(arr, arr + positives, 0);
    std::cout << "Positive elements: " << positives << std::endl;
    std::cout << "Sum of them: " << sum << std::endl;
 
    system("pause");
 
    return 0;
}

#include <iostream>
#include <algorithm>
#include <iterator>
#include <numeric>
 
bool positive (int x)
{
    return (x>0);
}
 
int main (void)
{
    const int SIZE = 10;
    int arr[SIZE] = { -1, 1, 5, 2, -4, 0, 7, -2, 5, -9 };
 
    std::cout << "Array:" << std::endl;
    std::copy(arr, arr + SIZE, std::ostream_iterator<int>(std::cout, " "));
    std::cout << std::endl;
 
    int positives = std::count_if(arr, arr + SIZE, positive);
    int sum = std::accumulate (arr, arr + SIZE, 0, positive); // ?
 
    std::cout << "Positive elements: " << positives << std::endl;
    std::cout << "Sum of them: " << sum << std::endl;
 
    system("pause");
    return 0;
}

#include <iostream>
#include <algorithm>
#include <numeric>
 
template <typename T>
struct PosSum {
    T operator () (const T & a, const T & b){
        return ( b > 0 ) ? a + b : a;
    }
};
 
int main(){
    const int SIZE = 5;
    int arr[SIZE] = { 1, -1, 2, -2, 0 };
 
    std::cout << "array: ";
    for ( int i = 0; i < SIZE; ++i )
        std::cout << arr[i] << ' ';
    std::cout << std::endl;
    std::cout << "Sum of positive elements: "
            << std::accumulate(arr, arr + SIZE, 0, PosSum<int>()) << std::endl;
 
    return 0;
}