Interpolation search is an algorithm used for searching a given value in an ordered indexed array. Interpolation search is sometimes called as extrapolation search. For uni formally distributed data items Interpolation search is the best method. for example: library books directory. Read more about C Programming Language.

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#include "stdio.h"
#include "stdlib.h"

#define MAX 200

int interpolation_search(int a[], int bottom, int top, int item) {

 int mid;
 while (bottom <= top) {
  mid = bottom + (top - bottom)
    * ((item - a[bottom]) / (a[top] - a[bottom]));
  if (item == a[mid])
   return mid + 1;
  if (item < a[mid])
   top = mid - 1;
  else
   bottom = mid + 1;
 }
 return -1;
}

int main() {
 int arr[MAX];
 int i, num;
 int item, pos;

 printf("nEnter total elements (num< %d) : ", MAX);
 scanf("%d", &num);

 printf("Enter %d Elements : ", num);
 for (i = 0; i < num; i++)
  scanf("%d", &arr[i]);

 printf("nELEMENTS AREn: ");
 for (i = 0; i < num; i++)
  printf("%dt", arr[i]);

 printf("nSearch For : ");
 scanf("%d", &item);
 pos = interpolation_search(&arr[0], 0, num, item);
 if (pos == -1)
  printf("nElement %d not foundn", item);
 else
  printf("nElement %d found at position %dn", item, pos);

 return 0;
}

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