C Program To Implement Interpolation Search

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;
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);
printf("nElement %d found at position %dn", item, pos);

return 0;
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