Write a function named sumIdx that searches a list of integers for a given value and returns the value + the index at which it was found. The index of a value not in the array is -1.

Hint: There are 3 parameters for this function, the array, its size, and the value you are searching for.

Example:

int ar[] = {1,2,3,4,5,6};

cout << sumIdx(arr,6,4) << endl;

cout << sumIdx(arr,6,0) << endl;

should output

7

-1.