How to find second greatest number in an array?

Source Code:

//second greates among array

#include<iostream>

using namespace std;

int great (int a[],int n)

{

     int i,greatest;

     greatest=a[0];

     for (i=0;i<n;i++)

     {

         if(a[i]>greatest)

  greatest=a[i];

     }

     return greatest;

}

int second (int a[],int n)

{

    int i,second,g;

    g=great(a,n);

    if(a[0]==g)

second=a[1];

    else

        second=a[0];

    for(i=0;i<n;i++)

    {

        if(a[i]>second&&a[i]<g)

        {

            second=a[i];

        }

    }

    return second;

}

int main()

{

    int n,a[40],j;

    cout<<"How many numbers? ";

    cin>>n;

    cout<<"Enter "<<n<<" numbers\n";

    for(j=0;j<n;j++)

        cin>>a[j];

    cout<<"The greatest number is "<<great(a,n)<<endl;

    cout<<"The second greatest number is "<<second(a,n)<<endl;

    system("pause");

    return 0;

}

Output: