How to create a Vector of Size N in Rust - Step by Step Examples

How to create a Vector of Size N in Rust ?

Answer

To create a vector of size N in Rust, you can use the vec! macro with the [value; N] syntax to initialize a vector with N elements all set to a specified value.

✐ Examples

1 Create a Vector of Integers of Size N

In this example,

We use the vec! macro to create a vector of integers. The vec! macro takes a list of values or uses the [value; N] syntax to initialize a vector with N elements.
In this example, we use [0; n] to create a vector of size n with all elements set to 0.
We assign the resulting vector to a variable named int_vector.
Finally, we print the vector using the println! macro to display its contents.

Rust Program

fn main() {
    let n = 5;
    let int_vector = vec![0; n];
    println!("{:?}", int_vector);
}

Output

[0, 0, 0, 0, 0]

2 Create a Vector of Strings of Size N

In this example,

We use the vec! macro to create a vector of strings. The vec! macro takes a list of values or uses the [value; N] syntax to initialize a vector with N elements.
In this example, we use [String::from(""); n] to create a vector of size n with all elements set to an empty string.
We assign the resulting vector to a variable named str_vector.
Finally, we print the vector using the println! macro to display its contents.

Rust Program

fn main() {
    let n = 5;
    let str_vector = vec![String::from(""); n];
    println!("{:?}", str_vector);
}

Output

["", "", "", "", ""]

3 Create a Vector of Booleans of Size N

In this example,

We use the vec! macro to create a vector of booleans. The vec! macro takes a list of values or uses the [value; N] syntax to initialize a vector with N elements.
In this example, we use [false; n] to create a vector of size n with all elements set to false.
We assign the resulting vector to a variable named bool_vector.
Finally, we print the vector using the println! macro to display its contents.

Rust Program

fn main() {
    let n = 5;
    let bool_vector = vec![false; n];
    println!("{:?}", bool_vector);
}

Output

[false, false, false, false, false]

Summary

In this tutorial, we learned How to create a Vector of Size N in Rust language with well detailed examples.

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