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Recap - If Else

Part of the Fundamentals section of Coddy's Rust journey — lesson 27 of 75.

Challenge

Beginner

You are given a code which gets as input two numbers n1 and n2 and a single char string op.

Note: we will learn in next lessons how to get input from the user, currently just don't touch the three first lines.

The possible values for op are "+", "-", "/" and "*"

Your task is to set the variable result based on the conditions:

if op is "+", set result with n1 + n2.
if op is "-", set result with n1 - n2.
if op is "/", set result with n1 / n2.
if op is "*", set result with n1 * n2.

Try it yourself

use std::io;

fn main() {
    let mut n1_input = String::new();
    let mut n2_input = String::new();
    let mut op_input = String::new();
    
    io::stdin().read_line(&mut n1_input).unwrap();
    io::stdin().read_line(&mut n2_input).unwrap();
    io::stdin().read_line(&mut op_input).unwrap();
    
    let n1: f64 = n1_input.trim().parse().unwrap();
    let n2: f64 = n2_input.trim().parse().unwrap();
    let op = op_input.trim();
    
    // Write your code below, use n1, n2 and op
    let result: f64 = 0.0;
    
    
    
    println!("{}", result);
}

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

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 StatementRecap - If ElseNested 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