Rust Tutorials

How to create a Two Dimensional Array in Rust

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How to create a Two Dimensional Array in Rust ?

Answer

To create a Two Dimensional Array in Rust, you can use an array of arrays or a vector of arrays.

✐ Examples

1 Creating a 2D Array of Integers using Arrays

In this example,

We declare and initialize a 2D array of integers named matrix with dimensions 3x3.
We assign values to the elements of the array.
The outer loop iterates over rows, and the inner loop iterates over columns to fill the array.

Rust Program

fn main() {
    let mut matrix = [[0; 3]; 3];
    for i in 0..3 {
        for j in 0..3 {
            matrix[i][j] = i + j;
        }
    }
    println!("{:?}", matrix);
}

Output

[[0, 1, 2], [1, 2, 3], [2, 3, 4]]

2 Creating a 2D Array of Characters using Vectors

In this example,

We include the standard library std::vec::Vec.
We declare and initialize a vector of arrays named matrix with dimensions 2x2.
We assign values to the elements of the vector.
The outer loop iterates over rows, and the inner loop iterates over columns to fill the vector.

Rust Program

fn main() {
    let mut matrix: Vec<[char; 2]> = Vec::new();
    for i in 0..2 {
        let mut row = ['A'; 2];
        for j in 0..2 {
            row[j] = (b'A' + (i + j) as u8) as char;
        }
        matrix.push(row);
    }
    println!("{:?}", matrix);
}

Output

[["A", "B"], ["B", "C"]]

Summary

In this tutorial, we learned How to create a Two Dimensional Array in Rust language with well detailed examples.

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How to create a Two Dimensional Array in Rust

How to create a Two Dimensional Array in Rust ?

Answer

✐ Examples

1 Creating a 2D Array of Integers using Arrays

Rust Program

Output

2 Creating a 2D Array of Characters using Vectors

Rust Program

Output

Summary

More Rust Arrays Tutorials