What Is Boolean In C++?

Maybe your like

ExploreEXPLORE THE CATALOGSupercharge your career with 700+ hands-on coursesView All CoursesPythonJavaJavaScriptCReactDockerVue JSRWeb DevDevOpsAWSC#LEARNING TOOLSExplore the industry's most complete learning platformCoursesLevel up your skillsSkill PathsAchieve learning goalsProjectsBuild real-world applicationsMock InterviewsNewAI-Powered interviewsPersonalized PathsGet the right resources for your goalsLEARN TO CODECheck out our beginner friendly courses.PricingFor BusinessResourcesNewsletterCurated insights on AI, Cloud & System DesignBlogFor developers, By developersFree CheatsheetsDownload handy guides for tech topicsAnswersTrusted answers to developer questionsGamesSharpen your skills with daily challengesSearchCoursesLog InJoin for freeWhat is boolean in C++?

A boolean data type in C++ is defined using the keyword bool. Usually, 11 (true) and 22 (false) are assigned to boolean variables as their default numerical values. Although any numerical value can be assigned to a boolean variable in C++, all values other than 00 are considered to be true and stored as 11, while 00 is considered to be false. Printing a bool variable on a console displays its numerical value.

Code

#include <iostream>using namespace std;int main() { // true = 1: bool p = true; if(p == 1) cout << "'p' is true." << endl; // false = 0: bool q = false; if(q == 0) cout << "'q' is false." << endl; // Every value other than 0 is stored as 1: bool r = -5; if(r == 1 && r == true) cout << "-5 is stored as 1 in 'r' and it is true." << endl; // 0 is stored as it is: bool t = 0; if(!t) cout << "'t' is false." << endl; return 0;}Run svg viewer

Using boolean in a numerical expression

A boolean variable in C++ can be used in a numerical expression as well. As mentioned above, if a bool variable is equal to true( or any numeric value other than 00), 11 is assigned to it and taken as 11 during the evaluation of the expression; 00 and false will be taken as 00.

Code

#include <iostream>using namespace std;int main() { bool x = 10; // x = 1; bool y = false; // y = 0; // Using bool in a numeric expression: cout << 2 * (x + y) << endl; return 0;}Run