Printing to Console

Part of the Fundamentals section of Coddy's Rust journey — lesson 29 of 75.

In Rust, you can print output to the console using the print! and println! macros. These macros allow you to display text, variables, and expressions in the console. The main difference between print! and println! is that println! adds a newline character at the end of the output, causing the next output to start on a new line, while print! does not.

Here's how you can use these macros:

let name = "Alice";
let age = 30;

print!("Name: ");
print!("{}", name);
println!(" is {} years old.", age);

println!("Hello, {}!", name);

This code will produce the following output:

Name: Alice is 30 years old.
Hello, Alice!

Challenge

Beginner

Write a Rust program that uses print! and println! macros to output the following:

Print "Hello, " and "Coddy!" on the same line.
Print "Rust is fun!" on a new line using println!.

Use the given variables inside the print macros.

Cheat sheet

In Rust, use print! and println! macros to display output to the console:

print! - prints without adding a newline
println! - prints and adds a newline at the end

Use {} as placeholders for variables:

let name = "Alice";
let age = 30;

print!("Name: ");
print!("{}", name);
println!(" is {} years old.", age);

println!("Hello, {}!", name);

Output:

Name: Alice is 30 years old.
Hello, Alice!

Try it yourself

fn main() {
    let hello = "Hello, ";
    let coddy = "Coddy!";
    let rust_is_fun = "Rust is fun!";
    // Write your code below

}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

Rust Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Modulo Operator Arithmetic Shortcuts Comparison Operators String Comparison

7Basic IO

Printing to ConsoleReading User Input Recap - Till 120 Recap - True or False

10Variable Bindings

Scope Shadowing Part 1 Variable Binding Shadowing Part 2

13Arrays Continued

Mutable Reference Arrays Array Methods Recap - Product Array Recap - Reversed Array Better Print

16Final Projects

Number Pattern Pattern Finder Student Grade Calculator

2Variables Part 1

Numbers Char String Boolean Mutable Variables

5Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3

8Calculator App

Welcome Message Getting Numbers

Basic Operations

Formatted Output

11Functions

Declaring Functions Parameters and Arguments Return Values Multiple Return Values Recap - Sigma Function Recap - Validation Function

14Iterating Over Arrays

Range Guide Enhanced For Loop Borrow In Loop Common Array Operations

3Variables Part 2

Type Declaration Naming Conventions Type Inference Recap - Initialize Variables Type Casting

6Decision Making

If Expressions If-Else Match Statement Recap - If Else Nested If - Else

9Loops

For Over Series While Loop Break Continue Nested Loop Loop Labels Infinite Loop Recap - Dynamic Input

12Arrays Basics

Declaring Arrays Array as Parameter Accessing Elements Modifying Arrays Recap - Pretty Print Array

15String Operations

String Methods format! Macro String Conversion Recap - Format