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Rust program to check a given number is the power of 2 using bitwise operator

Given an integer number, write a Rust program to check whether it is the power of 2 or not using bitwise operator.
Last Updated : September 25, 2021

Problem Statement

Here, we will create a 32-bit integer number and then we will read the number from the user and check the given number is the power of 2 using bitwise operators.

Program/Source Code

The source code to swap two bits of a 32-bit integer number is given below. The given program is compiled and executed successfully.

// Rust program to check a given number 
// is power of 2 using bitwise operator

use std::io;

fn main() {
    let mut num:i32 = 0;
    let mut input = String::new();
    
    println!("Enter number: ");
    io::stdin().read_line(&mut input).expect("Not a valid string");
    num = input.trim().parse().expect("Not a valid number");

    if (num & (num - 1)) != 0
    {
        println!("Given number is not power of 2.");
    }
    else
    {
        println!("Given number is power of 2.");
    }
}

Output

RUN 1:
Enter number: 
16
Given number is power of 2.

RUN 2:
Enter number: 
128
Given number is power of 2.

RUN 3:
Enter number: 
250
Given number is not power of 2.

Explanation

Here, we created an integer variable num with the initial value of 0. Then we read the value of num from the user. After that, we checked the given number is a power of 2 or not and printed the appropriate message.

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