FizzBuzz

Generate it:

lumen --examples fizzbuzz

N = 0

print 'N='
inputInt &N
println ''

i = 1

label loop

i15 = i % 15

if i15 == 0
    println 'FizzBuzz'
else
    i3 = i % 3

    if i3 == 0
        println 'Fizz'
    else
        i5 = i % 5

        if i5 == 0
            println 'Buzz'
        else
            println i
        endif
    endif
endif

i = i + 1

if i <= N
    jump loop
endif

The classic FizzBuzz, and the best single example of how the language pieces fit together:

• A label loop / conditional jump loop pair drives iteration from i = 1 up to N (see Labels & Jumps).
• % (modulo) checks divisibility by 15, then 3, then 5.
• Three levels of nested if/else/endif stand in for the elseif chain Lumen doesn’t have (see Conditionals).

Note the divisibility-by-15 check runs first — this is the same “check the most specific case first” trick FizzBuzz solutions need in any language, since 15 is also divisible by 3 and 5.