Nth biggest number

#include <iostream>
#include <algorithm>

using namespace std;
void printVec(int a)
{
    cout << a << endl;
}

int biggest(int a[], int num)
{
   int i, j, k;
   int big;
   int oldbigindex, bigindex;
   bigindex = -1;
   for(k = 0; k < num; k++)
   {
     big = -100000;
     for(i = 0; i < 10; i++)
     {
        if(k)
        {
           if(a[i] >= big && a[i] <= a[oldbigindex])
           {

                if(a[i] == a[oldbigindex] && i >= oldbigindex) continue;
                big = a[i];
                bigindex = i;
           }
        }
        else if(a[i] >= big)
        {
             big = a[i];
             bigindex = i;
        }
     }
     oldbigindex = bigindex;
   }
   return(big);
}



int main()
{
   int arr[10] = { 9, 10, 15, 4, 9, 7, 9, 6, 11, 4 };
   for_each(arr, arr+10, printVec);
   cout << "Third Big: " << biggest(arr, 3) << endl;
   cout << "Fourth Big: " << biggest(arr, 4) << endl;
   cout << "Fifth Big: " << biggest(arr, 5) << endl;
   cout << "Sixth Big: " << biggest(arr, 6) << endl;
   cout << "Seventh Big: " << biggest(arr, 7) << endl;
}