Rust program to search an item into the array using interpolation search

Rust | Array Example: Write a program to search an item into the array using interpolation search.
Submitted by Nidhi, on October 21, 2021

Problem Solution:

In this program, we will create an array of integer elements then we will read an item from the user and search the item into the array using the interpolation search technique.

Note: Interpolation search is used to search an item into a sorted array.

Program/Source Code:

The source code to search an item into the array using interpolation search is given below. The given program is compiled and executed successfully.

```// Rust program to search an item into array
// using interpolation search

use std::io;

fn main()
{
let mut arr:[usize;5] = [1,5,11,23,26];
let mut flag:usize   = 0;

let mut first:usize  = 0;
let mut last:usize   = 0;
let mut middle:usize = 0;

let mut item:usize = 0;
let mut input = String::new();

println!("Enter Item: ");
item = input.trim().parse().expect("Not a valid number");

first = 0;
last = 4;

middle = first + (((last - first) / (arr[last] - arr[first])) * (item - arr[first]));

while first<=last
{
if arr[middle] < item {
first = middle + 1;
}
else if arr[middle] == item {
flag=1;
println!("Item {0} found at index {1}", item, middle);
break;
}
else {
last = middle - 1;
}
middle = first + (((last - first) / (arr[last] - arr[first])) * (item - arr[first]));
}

if flag ==0 {
}
}
```

Output:

```Enter Item:
11
Item 11 found at index 2
```

Explanation:

Here, we created an array of the integer with 5 elements, and then we read the item from the user.

After that, we searched the item into the array using the interpolation search technique and print the index of the item into the array.

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