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#include <iostream>
int InterpolationSearch(int A[], int n, int x)
{
int low = 0;
int high = n - 1;
while (low <= high)
{
int mid = low + (((high - 1) * (x - A[low])) / (A[high] - A[low]));
if (x == A[mid])
return mid; // Found x, return (exit)
else if (x < A[mid])
high = mid - 1; // X lies before mid
else
low = mid + 1; // x lies after mid
}
return -1;
}
int main()
{
int A[] = {2, 4, 5, 7, 13, 14, 15, 23};
int x = 17;
int index = InterpolationSearch(A, 8, x); // passed array A inside the InterpolationSearch function
if (index != -1)
std::cout << "Number " << x << " is at " << index;
else
std::cout << "Number " << x << " not found";
}
// randomly set x bcoz array was defined by us , therefore not reasonable for asking input.
// We could have asked for input if array elements were inputed by the user.