Logical Operators Part 2

Part of the Fundamentals section of Coddy's Rust journey — lesson 21 of 75.

Logical operators have a special table called "Truth table" that shows what the combination of logical operators returns.

Truth table for the and (&&) operator:

a	b	a && b
false	false	false
false	true	false
true	false	false
true	true	true

The only way to get a true for the and (&&) operator is if both a and b are true

Truth table for the or (||) operator:

a	b	a \|\| b
false	false	false
false	true	true
true	false	true
true	true	true

In this case, to get a true result, either a or b should be true.

Truth table for the not (!) operator:

a	!a
false	true
true	false

Here the value of a is reversed. If a is false then !a is true

Challenge

Beginner

You need to assign integer values to variables b1 and b2 so that b3 evaluates to true in the expression: b3 = !((b1 + b2) > (b1 * b2)).

Cheat sheet

Truth tables show the results of logical operator combinations:

AND (&&) operator: Returns true only when both operands are true

a	b	a && b
false	false	false
false	true	false
true	false	false
true	true	true

OR (||) operator: Returns true when either operand is true

a	b	a \|\| b
false	false	false
false	true	true
true	false	true
true	true	true

NOT (!) operator: Reverses the boolean value

a	!a
false	true
true	false

Try it yourself

fn main() {
    // Type your code below
    let b1: i32 = ?;
    let b2: i32 = ?;
    let b3: bool = !((b1 + b2) > (b1 * b2));
    
    // Don\'t change the line below
    println!("b3 = {}", b3);
}

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 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 1Logical Operators Part 2Recap - 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