The ISO/ANSI C++ Standard has added certain new data types to the original C++ specifications. They are provided to provide better control in certain situations as well as for providing conveniences to C++ programmers. A boolean data type is declared with the bool keyword and can only take the values in either true or false form. One of the new data types is bool.
Syntax:
bool b1 = true; // declaring a boolean variable with true value
In C++, as mentioned earlier the data type bool has been introduced to hold a boolean value, true or false. The values true or false have been added as keywords in the C++ language.
Important Points
1. The default numeric value of true is 1 and false is 0.
2. We can use bool-type variables or values true and false in mathematical expressions also. For instance,
int x = false + true + 6;
3. is valid and the expression on the right will evaluate to 7 as false has a value of 0 and true will have a value of 1.
4. It is also possible to convert implicitly the data type integers or floating point values to bool type.
Example:
bool x = 0; // false
bool y = 100; // true
bool z = 15.75; // true
The most common use of the bool datatype is for conditional statements. We can compare conditions with a boolean, and also return them telling if they are true or false.
Below is the C++ program to demonstrate bool data type:
C++
#include <iostream>
using namespace std;
int main()
{
int x1 = 10, x2 = 20, m = 2;
bool b1, b2;
b1 = x1 == x2;
b2 = x1 < x2;
cout << "Bool1 is = " <<
b1 << "\n" ;
cout << "Bool2 is = " <<
b2 << "\n" ;
bool b3 = true ;
if (b3)
cout << "Yes" << "\n" ;
else
cout << "No" << "\n" ;
int x3 = false + 5 * m - b3;
cout << x3;
return 0;
}
|
Output
Bool1 is = 0
Bool2 is = 1
Yes
9
Last Updated :
27 Sep, 2022
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