Exactly the way numbers can be combined with addition and multiplication,
Boolean expressions can be combined with Logical Operators^{3.1}:

Example | Name | Result |

$a && $b | And | $a if $a is false, $b otherwise |

$a || $b | Or | $a if $a is true, $b otherwise |

! $a | Not | True if $a is not true |

$a and $b | And | $a if $a is false, $b otherwise |

$a or $b | Or | $a if $a is true, $b otherwise |

not $a | Not | True if $a is not true |

$a xor $b | Xor | True if $a or $b is true, but not both |

With 0 for false and 1 for true, binary addition is almost the same as boolean or. Binary multiplication is almost the same as boolean and. They function exactly the same because binary 10 (decimal 2) is true in perl. Thus, (1 and 1) is true in perl and (1+1) is true in perl.

+ | 0 | 1 | * | 0 | 1 | ||

0 | 0 | 1 | 0 | 0 | 0 | ||

1 | 1 | 10 | 1 | 0 | 1 | ||

||, or | 0 | 1 | &&, and | 0 | 1 | ||

0 | 0 | 1 | 0 | 0 | 0 | ||

1 | 1 | 1 | 1 | 0 | 1 |

The value of the boolean expression can be saved in a variable.

- $boolean = (2+4) eq 6;
print "$boolean\n";

- 1