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non

Translation status: 繁體中文 reader-locale proof. Code fences render through the zh-Hant pipeline; prose is canonical Latin.

Negates a boolean expression.

Aliases: !

Syntax: non <expression>

Category#

logic

Examples#

radix/corpus/non/non.fab (canonical · keyword)#

Negates a boolean expression.

# =============================================================================
# non — Negates a boolean expression.
# =============================================================================
#
# What this teaches:
#   • the `non` keyword — unary boolean negation (equivalent to `!`)
#
# Common mistakes:
#   • Confusing non (logical negation) with ≠ (inequality comparison) — non negates a boolean, ≠ compares two values.
#
# See also: verum, falsum
# =============================================================================

# non — logical not
#
# GRAMMAR:
#   unaryExpr :← 'non' expr
#
# EXPECTED OUTPUT:
#   Scalar stdout smoke (see body).
#

main {
    const _ flag ← false
    const _ negated ← not flag
    print negated
}

test "non negates falsum" {
    const _ flag ← false
    const _ negated ← not flag
    assert negated
}

test "non negates verum" {
    const _ flag ← true
    const _ negated ← not flag
    assert negated ≡ false
}

test "non applied twice returns the original" {
    const _ flag ← false
    const _ negated ← not flag
    const _ bis ← not negated
    assert bis ≡ false
}

Expected output:

verum