# Boolean literals

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< cpp‎ | language

### Syntax

`true` | (1) |
`false` | (2) |

### Explanation

The Boolean literals are the keywords true and false. They are prvalues of type `bool`.

### Notes

See Integral conversions for implicit conversions from `bool` to other types and boolean conversions for the implicit conversions from other types to `bool`.

### Keywords

`false`, `true`

### Example

Run this code

    #include <iostream>

    int main()
    {
        std::cout << std::boolalpha
                  << true << '\n'
                  << false << '\n'
                  << std::noboolalpha
                  << true << '\n'
                  << false << '\n';
    }

Output:

    true
    false
    1
    0

### References

- C++23 standard (ISO/IEC 14882:2024):

  - 5.13.6 Boolean literals [lex.bool]

- C++20 standard (ISO/IEC 14882:2020):

  - 5.13.6 Boolean literals [lex.bool]

- C++17 standard (ISO/IEC 14882:2017):

  - 5.13.6 Boolean literals [lex.bool]

- C++14 standard (ISO/IEC 14882:2014):

  - 2.13.6 Boolean literals [lex.bool]

- C++11 standard (ISO/IEC 14882:2011):

  - 2.13.6 Boolean literals [lex.bool]

- C++98 standard (ISO/IEC 14882:1998):

  - 2.13.5 Boolean literals [lex.bool]

### See also

C documentation for Predefined Boolean constants

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