Find all occurance of an element in an array.

Answer:

Here's a code snippet to find all occurance of an element in an array.

        
            #include 
            using namespace std;
            
            int all_occurance(int a[], int n,int key, int index){
                
                if(index == n){
                    return 0;
                }
                if(a[index] == key)
                    cout << index << " ";
                    all_occurance(a,n, key, index+1);
            
                return 0;
            }
            
            int main()
            {
                int n;
                cin>>n;
                int arr[n];
                for (int i = 0; i < n; ++i)
                {
                    cin>>arr[i];
                }
            
                int key;
                cin>>key;
                int index = 0;
                all_occurance(arr, n, key, index);
                return 0;
            }