Зміст курсу
C++ Data Types
C++ Data Types
2. Numerical Data Types
4. Other Data Types and Concepts
Boolean
Boolean (bool) is a data type that can take one of two values: true or false. Syntax:
They are mostly used in comparison operators. Those operators (==, !=, <, >, >=, <=) return bool.
Note
std::coutprints booleans as numbers,1if the boolean istrue, and0if the boolean isfalse.
main
#include <iostream> int main() { bool istrue = true; bool obv = (5 > 0); bool wrong = (2 * 2 == 5); std::cout << istrue << std::endl; std::cout << obv << std::endl; std::cout << wrong << std::endl; }
You can also flip the value of a boolean using the ! operator:
main
#include <iostream> int main() { bool istrue = true; std::cout << istrue << std::endl; std::cout << !istrue << std::endl; }
And most frequently, they are used as conditions in if/while/... statements.
main
#include <iostream> int main() { bool b = true; if (b) std::cout << "b is true" << std::endl; if (1 > 0) std::cout << "1 is greater than 0" << std::endl; }
The size of a bool in C++ is 1 byte. Yes, it would fit in 1 bit of memory, but you can't store a variable of size less than 1 byte (8 bit) in C++
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