interpolation.c

Interpolation search implemented in c

Searches/interpolation_search.c

@@ -0,0 +1,44 @@
+
+int interpolationSearch(int arr[], int n, int x)
+{
+    int lo = 0, hi = (n - 1);
+ 
+    while (lo <= hi && x >= arr[lo] && x <= arr[hi])
+    {
+       
+        int pos = lo + (((double)(hi-lo) /
+              (arr[hi]-arr[lo]))*(x - arr[lo]));
+ 
+       
+        if (arr[pos] == x)
+            return pos;
+ 
+        
+        if (arr[pos] < x)
+            lo = pos + 1;
+ 
+        else
+            hi = pos - 1;
+    }
+    return -1;
+}
+ 
+
+int main()
+{
+    // Array of items on which search will
+    // be conducted.
+    int arr[] =  {10, 12, 13, 16, 18, 19, 20, 21, 22, 23,
+                  24, 33, 35, 42, 47};
+    int n = sizeof(arr)/sizeof(arr[0]);
+ 
+    int x = 18; // Element to be searched
+    int index = interpolationSearch(arr, n, x);
+ 
+    // If element was found
+    if (index != -1)
+        printf("Element found at index %d", index);
+    else
+        printf("Element not found.");
+    return 0;
+}