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Rust program to check an item contains in HashSet or not

Rust | HashSet Example: Write a program to check an item contains in HashSet or not.
Last Updated : October 26, 2021

Problem Statement

In this program, we will read an integer item from the user then we will check an item is available in HashSet or not.

Program/Source Code

The source code to check an item contains in HashSet or not is given below. The given program is compiled and executed successfully.

// Rust program to check an item contains
// in HashSet or not

use std::collections::HashSet;
use std::io;

fn main() {
    let mut set:HashSet<i32> = HashSet::new();
    let mut item:i32=0;
    let mut input = String::new();

    set.insert(10);
    set.insert(20);
    set.insert(30);
    set.insert(40);
    set.insert(50);
    
    println!("HashSet: \n{:?}",set);
    
    println!("Enter Item: ");
    io::stdin().read_line(&mut input).expect("Not a valid string");
    item = input.trim().parse().expect("Not a valid number");
    
    if(set.contains(&item))
    {
        println!("Item {} is available in HashSet",item);
    }
    else
    {
        println!("Item {} is not available in HashSet",item);
    }
}

Output

HashSet: 
{20, 40, 50, 30, 10}
Enter Item: 
30
Item 30 is available in HashSet

Explanation

Here, we created a HashSet to store integer elements. Then we added items using the insert() method. After that, we read an item from the user and check an item exists in HashSet or not, and print the appropriate message.

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