Rust Vector access guide

Last update on December 21 2024 10:19:32 (UTC/GMT +8 hours)

Write a Rust program to create a vector with integers 1 to 10. Print the element at index 4.

Sample Solution:

Rust Code:

// Define the main function
fn main() {
    // Create a vector with integers 1 to 10
    let numbers: Vec<i32> = (1..=10).collect(); // Use the collect() method to create a vector from a range

    // Print the element at index 4
    if let Some(element) = numbers.get(4) { // Use the get() method to access the element at index 4
        println!("Element at index 4 is: {}", element);
    } else {
        println!("Index 4 is out of bounds.");
    }
}

Output:

Element at index 4 is: 5

Explanation:

Here is a brief explanation of the above Rust code:

• fn main() {: This line defines the main function, which is the entry point of the program.
• let numbers: Vec<i32> = (1..=10).collect();: This line creates a vector "numbers" containing integers from 1 to 10 using the "collect()" method with a range (1..=10).
• if let Some(element) = numbers.get(4) {: This line attempts to access the element at index 4 using the "get()" method. If the element exists (i.e., the index is within bounds), it assigns the element to the variable 'element'.
• println!("Element at index 4 is: {}", element);: If the index is within bounds, it prints the element at index 4.
• } else { println!("Index 4 is out of bounds."); }: If the index is out of bounds (i.e., the element does not exist), it prints a message indicating that index 4 is out of bounds.

This program creates a vector with integers from 1 to 10 and then prints the element at index 4. If index 4 is out of bounds, it prints a corresponding error message.

Rust Code Editor:

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