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Write a Rust function to reverse the order of elements in a vector.

Utpal Vishwas 331 20 Jun 2023

Write a Rust function to reverse the order of elements in a vector.

rust programsrust
Updated 24 Jun 2023
Utpal Vishwas
Utpal Vishwas

Student

I am Utpal Vishwas from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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1 Answers

Aryan Kumar
Aryan Kumar 24 Jun 2023
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Sure, here is a Rust function to reverse the order of elements in a vector:

Rust

fn reverse_vector(vector: &mut Vec<i32>) {
  // Initialize two iterators, one at the beginning of the vector and one at the end.
  let mut i = 0;
  let mut j = vector.len() - 1;

  // Loop while the iterators haven't crossed.
  while i < j {
    // Swap the elements at the two iterators.
    let temp = vector[i];
    vector[i] = vector[j];
    vector[j] = temp;

    // Increment i.
    i += 1;

    // Decrement j.
    j -= 1;
  }
}

fn main() {
  // Create a vector.
  let mut vector = vec![1, 2, 3, 4, 5];

  // Reverse the order of the elements in the vector.
  reverse_vector(&mut vector);

  // Print the vector.
  for i in 0..vector.len() {
    println!("{}", vector[i]);
  }
}

This function first initializes two iterators, one at the beginning of the vector and one at the end. The function then loops while the iterators haven't crossed. In each iteration of the loop, the function swaps the elements at the two iterators. The function then increments i and decrements j. Finally, the function prints the vector.

To run this program, you can save it as a .rs file and then compile and run it using the following commands:

Code snippet

rustc reverse_vector.rs
./reverse_vector

This will print the following output:

Code snippet

5
4
3
2
1

This indicates that the order of the elements in the vector has been reversed.

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