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Home Forums Write a function to count the number of vowels in a given string in Rust. – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 23 Jun 2023
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Sure, here is a Rust function to count the number of vowels in a given string:

Rust

fn count_vowels(str: &str) -> usize {
  // Create a set of vowels.
  let vowels = ['a', 'e', 'i', 'o', 'u'];

  // Initialize a counter to track the number of vowels.
  let mut count = 0;

  // Iterate over the characters in the string.
  for c in str.chars() {
    // Check if the character is a vowel.
    if vowels.contains(&c) {
      // Increment the counter.
      count += 1;
    }
  }

  // Return the number of vowels.
  return count;
}

fn main() {
  let str = "hello";

  let count = count_vowels(str);
  println!("The number of vowels in the string is: {}", count);
}

This function first creates a set of vowels. The function then initializes a counter to track the number of vowels. The function then iterates over the characters in the string. For each character, the function checks if the character is a vowel. If the character is a vowel, the function increments the counter. Finally, the function returns the number of vowels.

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 count_vowels.rs
./count_vowels

This will print the following output:

Code snippet

The number of vowels in the string is: 2

This indicates that the string hello has 2 vowels.

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