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C++ Introduction
course content

Course Content

C++ Introduction

C++ Introduction

1. Getting Started
What is C++Entry Point of a ProgramStandard Library and FilesPreprocessor DirectivesThe First Program
2. Introduction to Operators
Operators IntroductionArithmetic Operators PracticeRelational OperatorsLogical Operators
3. Variables and Data Types
Data TypesUnderstanding VariablesNumerical Data TypesIntroduction to StringIntroduction to ArraysWorking with the Array
4. Introduction to Program Flow
Conditional StatementsTernary OperatorSwitch StatementWhile LoopFor LoopPracticing With Loops
5. Introduction to Functions
What are Functions?Type of FunctionsReturn Statement in Functions Simple Function Practice

book
Logical Operators

You can use logical operators AND (&&), OR (||) and NOT (!) to evaluate multiple conditions simultaneously.

  • AND (&&) returns true only if both conditions are true. For example, checking if an account balance is sufficient and the withdrawal amount is positive;

  • OR (||) returns true if at least one condition is true. For example, checking if a balance is sufficient or the user has a credit card;

  • NOT (!) negates a condition, turning true into false and vice versa. For example, checking if an account is not locked.

Imagine you need to create conditions for user authentication. Let’s explore some scenarios.

ConditionAuthorization StatusState of Password, Login, Phone Call, and Internet
Password AND login are correctAuthorized (true)Password: true
Login: true
Phone Call: N/A
Internet: N/A
Password AND login are correct, OR with a phone call identificationAuthorized (true)Password: true
Login: false
Phone Call: true
Internet: N/A
There is NO internetNot Authorized (false)Password: N/A
Login: N/A
Phone Call: N/A
Internet: false
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logical_and

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logical_or

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logical_not

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#include <iostream>

int main()
{
    // Using AND (&&) operator for password and login
    //     Login is correct = `true`
    //     Password is correct = `true`
    std::cout << "User authorized (password AND login correct)" 
              << (true && true) << std::endl;
}

1. Which logical operator is used to check if both conditions are true?

2. Which logical operator is used to check if at least one condition is true?

3. What does the ! operator do?

Which logical operator is used to check if both conditions are true?

Which logical operator is used to check if both conditions are true?

Select the correct answer

Which logical operator is used to check if at least one condition is true?

Which logical operator is used to check if at least one condition is true?

Select the correct answer

What does the `!` operator do?

What does the ! operator do?

Select the correct answer

Everything was clear?

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Section 2. Chapter 4
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