Object Oriented Programming with C++, Second Edition

19.2 TYPE Bool

A new data type bool is added to C++ recently. The term “bool” is a short form of Boolean. We have worked with if statement earlier. We test for a condition to be true or false before taking decision. Condition basically stands for a quantity having value true or false. Conditional expressions were returning value of type int. If the value is zero result is treated as false. For non-zero value, result is treated as true. This is only an arrangement. This arrangement continues even today.

Now C++ language supports keywords true and false.

The relationship between true and false can be expressed as:

! false == true and

! true == false

We can declare a variable as follows:

bool var1 ;

We can assign value true or false to this variable ...