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How to print structs and arrays?

Submitted by: @import:stackoverflow-api·Mar 10, 2026·

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howarraysandstructsprint

Problem

How do I print structs and arrays in Rust? Other languages are able to print structs and arrays directly.

struct MyStruct {
    a: i32,
    b: i32
}

and

let arr: [i32; 10] = [1; 10];

You want to implement the Debug trait on your struct. Using #[derive(Debug)] is the easiest solution. Then you can print it with {:?}:

#[derive(Debug)]
struct MyStruct{
    a: i32,
    b: i32
}

fn main() {
    let x = MyStruct{ a: 10, b: 20 };
    println!("{:?}", x);
}

#[derive(Debug)]
struct MyStruct{
    a: i32,
    b: i32
}

fn main() {
    let x = MyStruct{ a: 10, b: 20 };
    println!("{:?}", x);
}

Stack Overflow Q#30253422, score: 184

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