sin

Adds an else-if branch after a previous si branch.

Aliases: else if

Syntax: sin <condition> <block>

Category#

control-flow

Related#

• si
• secus

Examples#

radix/corpus/si/sin.fab (canonical · keyword)#

Adds an else-if branch after a previous si branch.

# =============================================================================
# sin — Adds an else-if branch after a previous si branch.
# =============================================================================
#
# What this teaches:
#   • Else-if chains — `sin <condition> { body }` adds intermediate conditional
#     branches between `si` and `secus`
#   • First match wins: evaluation stops at the first `si` or `sin` whose
#     condition is `verum`
#
# Common mistakes:
#   • TODO: forgetting that `sin` blocks are skipped once a preceding branch
#     matches
#
# See also: si, secus
# =============================================================================

# si-sin-secus (poetic if-else-if chain)
#
# si <cond> { }
# sin <cond> { }
# secus { }
#
# GRAMMAR:
#   ifStmt :← 'si' expr block ('sin' expr block)* ('secus' block)?
#
# EXPECTED OUTPUT:
#   Afternoon (hour=14 matches first sin branch).

main {
    const _ hour ← 14

    if hour < 6 {
        print "Late night"
    }
    elif hour < 12 {
        print "Morning"
    }
    elif hour < 18 {
        # 14 ≥ 12 and 14 < 18
        print "Afternoon"
    }
    elif hour < 22 {
        print "Evening"
    }
    else {
        print "Night"
    }
}

Expected output:

Afternoon

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

Adds an else-if branch after a previous si branch.

# =============================================================================
# sin — Adds an else-if branch after a previous si branch.
# =============================================================================
#
# What this teaches:
#   • Standalone else-if — `sin` provides an intermediate conditional branch
#     evaluated only when the preceding `si` condition was `falsum`
#   • Chains: `si { } sin { } secus { }` for multi-way branching
#
# Common mistakes:
#   • Writing `secus si` instead of the canonical `sin` for else-if branches.
#
# See also: si, secus
# =============================================================================

# sin — else-if branch
#
# GRAMMAR:
#   elseIfClause :← 'sin' expr block
#
# EXPECTED OUTPUT:
#   Scalar stdout smoke (see body).
#
# BACKEND:
#   Cross-ref: si/sin.fab.
#

main {
    const _ score ← 85
    if score ≥ 90 {
        print "excellent"
    }
    elif score ≥ 80 {
        print "good"
    }
    else {
        print "needs work"
    }
}

Expected output:

good