Вычислить процент положительных чисел, процент отрицательных чисел и процент нулей

#include <iostream>
#include <ctime>
#include <cstdlib>
#include <algorithm>
#include <iterator>
int main()
{
    srand(time(nullptr));
    const int count = 100;
    int *arr = new int[100];
    std::for_each(arr, arr + count, [](int &x){x = rand() % 201 - 100; });
    std::copy(arr, arr + count, std::ostream_iterator<int>(std::cout, " "));
    std::cout << std::endl;
    std::cout << "Positive numbers: " << std::count_if(arr, arr + count, [](int &x){return x > 0; })/(double)count*100 << "%" <<std::endl;
    std::cout << "Zeros: " << std::count_if(arr, arr + count, [](int &x){return x == 0; }) / (double)count * 100 << "%" << std::endl;
    std::cout << "Negative numbers: " << std::count_if(arr, arr + count, [](int &x){return x < 0; }) / (double)count * 100 << "%" << std::endl;
    std::cout << "Even numbers: " << std::count_if(arr, arr + count, [](int &x){return !(x%2); }) / (double)count * 100 << "%" << std::endl;
    std::cout << "Odd numbers: " << std::count_if(arr, arr + count, [](int &x){return x % 2; }) / (double)count * 100 << "%" << std::endl;
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    srand(time(0)); 
    int i, k1=0, k2=0, k3=0;    
 
    int *a = new int [100];    
 
    for (i = 1; i <=100; i++) 
    {
    a[i]= rand() %201-100;
    if (a[i]>0) k1++;
    if (a[i]<0) k2++;
    if (a[i]%2) k3++;
    }                         
    cout <<"%positive="<<k1<<endl;        
    cout <<"%negative="<<k2<<endl;
    cout <<"%zeros="<<100-k1-k2<<endl;
    cout <<"%even="<<k3<<endl;
    cout <<"%odd="<<100-k3<<endl; 
    delete [] a;
system("pause");
return 0;
}