Menu

Tech

English

Formatted Output

Part of the Fundamentals section of Coddy's Rust journey. Lesson 36 of 75.

Challenge

Beginner

Modify the output so that it will always print a float value with two decimal places. To do it use the {:.2} sign:

let num = 1.5576734;
println!("This is rounded: {:.2}", num);
// Output: This is rounded: 1.56

Try it yourself

use std::io;

fn main() {
    println!("Calculator App");

    let mut input_num1 = String::new();
    let mut input_num2 = String::new();
    io::stdin().read_line(&mut input_num1).unwrap();
    io::stdin().read_line(&mut input_num2).unwrap();
    let num1: f64 = input_num1.trim().parse().unwrap();
    let num2: f64 = input_num2.trim().parse().unwrap();
    let sum = num1 + num2;
    let difference = num1 - num2;
    let product = num1 * num2;
    let quotient = num1 / num2;
    println!("Sum: {}", sum);
    println!("Difference: {}", difference);
    println!("Product: {}", product);
    println!("Quotient: {}", quotient);
}

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 Console Reading 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

Project lesson

Basic Operations

Project lesson

Formatted Output Project lesson

Project lesson

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

Practice on your own: Online Rust compiler