Outputting Binary search

I have a problem now..

i am doing binary search on a few inputs

but i can't seem to make it output whether the number is found ot not. below is my code for it.

#include <iostream>
using namespace std;

int binarysearch(int sortedarray[100], int first, int last, int key)
{
while (first <= last )
{
int mid = ( first + last ) / 2;
if (key> sortedarray[mid] )
first = mid + 1;
else if (key < sortedarray[mid])
last = mid - 1;
else return mid;
}
return - (first+1);
}

void main()
{
int nums, a[100], finds;
cout<<"Please enter no. of inputs.";
cin>> nums;
for (int i=0; i<nums; i++)
{
cout<<"Please enter your inputs.";
cin>>a[i];
}
cout<<"enter the number you want to find.";
cin>> finds;
binarysearch(a,a[0],a[nums],finds);
}


if anyone could help. really thanks alot.

i need to put my cout statement somewhere but i can't seem to figure out where

See the changes

oh my. really thanks alot. grateful to u man.

now im gonna try to understand the code.

thanks again! =D