gy25_2,3,4

#include <iostream>

using namespace std;

int main()
{
    int n,a[50],d=0;

    cout<<"Tagok szama-->";cin>>n;

    for(int i=0;i<n;i++)
        cin>>a[i];
    for(int i=0;i<n;i++)
        if(a[i]%2==0) d=d+1;
    cout<<"DB-->"<<d;
    return 0;
}
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#include <iostream>

using namespace std;

int main()
{
    int a[50],n,d=1;

    cout<<"Tagok szama-->";cin>>n;

    for(int i=1;i<=n;i++)
        cin>>a[i];
     for(int i=1;i<=n;i++)
            if(i%2==0)
              d=d*a[i];
     cout<<"Paros indexu elemek szorzata-->"<<d;


    return 0;
}
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#include <iostream>

using namespace std;

int main()
{
    int a[50],n,x,d=0;

    cout<<"Tagok szama-->";cin>>n;
    cout<<"X-->";cin>>x;

    for(int i=1;i<=n;i++)
        cin>>a[i];
     for(int i=1;i<=n;i++)
        if(a[i]%x==0)
          d=d+a[i];

    return 0;
}
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++