The Basic Program

Rust code is always put in a file with .rs extension

fn main() {
    println!("Hello World!");
}

Basic Formatting

In Rust, unlike other languages, we cannot directly print numbers or variables within the
macro. We need a placeholder trait{}.

In Rust, a trait is a way to define a set of methods that can be implemented on different types.

Positional Arguments

fn main() {
    println!("Number: {}", 1);
}

fn main() {
    println!("{} last name is {} ", "Rachel", "Green");
}

Named Arguments

fn main() {
    println!("{fname} last name is {lname} ", lname="Green", fname="Rachel");
}

Basic Math

fn main() {
    println!("{} * {} = {}",15, 15, 15 * 15);
}

A trait in Rust is a group of methods that are defined for a particular type.

Printing formatters

fn main() {
    println!("Number : 20 \nBinary:{:b} Hexadecimal:{:x} Octal:{:o}", 20, 20, 20);
}

Debug Trait {:?}

In Rust, the Debug trait is a built-in trait that allows types to be formatted for debugging purposes. It is primarily used by the println! and related macros to print a text representation of a value when used with the {:?} formatter.

fn main() {
    println!("{:?}", (100, "Rachel Green"));
}

Printing Styles