Variablen, Ausdrücke und Kontrollfluss

BEGIN {
    print 7 + 2, 7 - 2, 7 * 2, 7 / 2, 7 % 3, 2 ^ 10, 2 ** 3
    a = 5; a += 3; a *= 2; print a
    i = 1; i++; ++i; print i
    print (3 < 5), (3 == 3), (3 != 3), ("a" < "b")
    print (1 && 0), (1 || 0), !1
    print "Text" " " "wird" " " "verkettet"
    s = "abc"; print s s
    print 1 " " 2
    print 10 / 3
    printf "%.2f\n", 10 / 3
    print int(3.99), int(-3.99)
    print sqrt(16), exp(0), log(1), sin(0), cos(0)
    print length("hallo")
    print 1e3, 0x10, 010
}

BEGIN {
    n = 15
    if (n % 15 == 0) print "FizzBuzz"
    else if (n % 3 == 0) print "Fizz"
    else if (n % 5 == 0) print "Buzz"
    else print n

    status = (n > 10) ? "groß" : "klein"
    print status

    s = "apfel"
    if (s ~ /^a/) print "beginnt mit a"
    if (s !~ /z/) print "kein z"
    if (!(s in meine_liste)) print "nicht im Array"
    if (length(leer) == 0) print "unbelegte Variable ist leer"
    print (leer == 0), (leer == "")
}

BEGIN {
    for (i = 1; i <= 5; i++) printf "%d ", i
    print ""
    j = 0
    while (j < 3) { printf "w%d ", j; j++ }
    print ""
    k = 10
    do { printf "k=%d ", k; k++ } while (k < 12)
    print ""
    for (i = 1; i <= 10; i++) {
        if (i % 2 == 0) continue
        if (i > 7) break
        printf "%d ", i
    }
    print ""
    # verschachtelt
    for (z = 1; z <= 3; z++) {
        for (s = 1; s <= 3; s++) printf "%3d", z * s
        print ""
    }
}

function quadrat(x) { return x * x }
function maximum(a, b) { return a > b ? a : b }
function fak(n) { return n <= 1 ? 1 : n * fak(n - 1) }
function wiederhole(text, n,    erg, i) {      # lokale Variablen durch zusätzliche Parameter
    for (i = 0; i < n; i++) erg = erg text
    return erg
}

BEGIN {
    print quadrat(7), maximum(3, 9), fak(10)
    print wiederhole("ab", 3)
    print fak(20)
}