# Rust program to swap two bytes of a number

Here, we are going to learn how to swap two bytes of a number in Rust programming language?
Submitted by Nidhi, on September 24, 2021

Problem Solution:

Here, we will create a 16-bit integer number and then we will swap bytes of the given number and print the result.

Program/Source Code:

The source code to swap two bytes of a number is given below. The given program is compiled and executed successfully.

```// Rust program to swap two bytes of a number.

fn main()
{
let mut num:u16 = 0x1234;

println!("Number before swapping bytes is: {:#02x}", num);

num = ((num << 8) & 0xff00) | ((num >> 8) & 0x00ff);

println!("Number after swapping bytes is: {:#02x}", num);
}
```

Output:

```Number before swapping bytes is: 0x1234
Number after swapping bytes is: 0x3412
```

Explanation:

Here, we created a 16-bit integer variable num with an initial value of 0x1234. Then we swapped bytes of the number using bitwise operators and printed the result.