Comparison Operators

Part of the Fundamentals section of Coddy's Rust journey — lesson 18 of 75.

Comparison operators are used to compare between two operands.

Sometimes we need to check whether an operand is bigger/smaller/... than another operand. The following table shows possible operators for comparison:

Operator	Meaning	Example
==	Equal	1 == 2 returns false
!=	Not Equal	1 != 2 returns true
>	Greater Than	1 > 2 returns false
<	Lower Than	1 < 2 returns true
>=	Greater or Equal	1 >= 2 returns false
<=	Lower or Equal	1 <= 2 returns true

The comparison operator returns true if the comparison is correct or false otherwise.

For example:

let var1: i32 = 13;
let var2: i32 = 12;
let var3: bool = var1 != var2;

var3 will hold true because var1 and var2 are not equal

Remember the boolean type, var3 is a boolean.

Challenge

Beginner

Write a script that initializes 2 variables n1 and n2 with the values 8 and 9 (accordingly).

After that initialize another variable n3 that will hold whether n1 is bigger than n2.

Cheat sheet

Comparison operators are used to compare between two operands and return true or false:

Operator	Meaning	Example
==	Equal	1 == 2 returns false
!=	Not Equal	1 != 2 returns true
>	Greater Than	1 > 2 returns false
<	Lower Than	1 < 2 returns true
>=	Greater or Equal	1 >= 2 returns false
<=	Lower or Equal	1 <= 2 returns true

Example usage:

let var1: i32 = 13;
let var2: i32 = 12;
let var3: bool = var1 != var2; // var3 will hold true

Try it yourself

fn main() {
    // Type your code below
    
    
    // Don\'t change the line below
    println!("n1 = {}, n2 = {}, n3 = {}", n1, n2, n3);
}

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 ShortcutsComparison OperatorsString 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

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