Primitive Data Types and Type Inference

Snippet

Primitive Data Types and Type Inference

Rust has several primitive scalar types: integers (i32, i64), floating-point numbers (f64), characters (char), and booleans (bool). The compiler can infer types in many cases, but you can explicitly annotate them with a colon and type name.

snippet.rs

rust

fn main() {
    let integer: i32 = 42;
    let float = 3.14;        // f64 by default
    let character = 'R';
    let is_active = true;
    
    println!("Integer: {integer}");
    println!("Float: {float}");
    println!("Char: {character}");
    println!("Boolean: {is_active}");
}

Breakdown

let integer: i32 = 42;

Signed 32-bit integer with explicit type annotation

let float = 3.14;

Floating-point number, compiler infers f64 type by default

let character = 'R';

Single Unicode character enclosed in single quotes

let is_active = true;

Boolean value, either true or false

println!("Integer: {integer}");

Prints integer using string interpolation

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