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Bool data type in C++

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  • Difficulty Level : Easy
  • Last Updated : 05 Jun, 2017
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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.
One of the new data type is: bool

bool b1 = true;      // declaring a boolean variable with true value   

In C++, 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:

  • The default numeric value of true is 1 and false is 0.
  • We can use bool type variables or values true and false in mathematical expressions also.For instance,
    int x = false + true + 6;

    is valid and the expression on right will evaluate to 7 as false has value 0 and true will have value 1.

  • It is also possible to convert implicitly the data type integers or floating point values to bool type. For example, the statements-

    bool x = 0;  // false
    bool y = 100;  // true
    bool z = 15.75;  // true


// CPP program to illustrate bool 
// data type in C++
using namespace std;
int main()
    int x1 = 10, x2 = 20, m = 2;
    bool b1, b2;
    b1 = x1 == x2; // false
    b2 = x1 < x2; // true
    cout << "b1 is = " << b1 << "\n";
    cout << "b2 is = " << b2 << "\n";
    bool b3 = true;
    if (b3)
        cout << "Yes" << "\n";
        cout << "No" << "\n";
    int x3 = false + 5 * m - b3;
    cout << x3;
return 0;


b1 is = 0
b2 is = 1

Related article: How to use Bool in C?

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