I HAZ A FIBO, RLY

First LOLCODE program, run here. This program inputs a Fibonacci number from the user, then determines and prints whether the number is in the Fibonacci series. What do you think?

HAI 1.2

    HOW IZ I GetNum

        VISIBLE "Entr yr numbr: "

        I HAS A WatzNum
        GIMMEH WatzNum

        FOUND YR WatzNum

    IF U SAY SO

    HOW IZ I ProovFibo YR Num

        I HAS A Fibo1 ITZ 1
        I HAS A Fibo2 ITZ 2

        IM IN YR Nums

            BOTH SAEM Num AN Fibo1, O RLY?
                YA RLY
                    VISIBLE "YEAH, FIBONACCI NUM!"
                    GTFO
                NO WAI
            OIC

            BOTH SAEM Num AN Fibo2, O RLY?
                YA RLY
                    VISIBLE "YEAH, FIBONACCI NUM!"
                    GTFO
                NO WAI
            OIC

            BOTH SAEM Fibo2 AN BIGGR OF Num AN Fibo2
            O RLY?
                YA RLY
                    DIFFRINT Num AN Fibo1, O RLY?
                        YA RLY
                            DIFFRINT Num AN Fibo2, O RLY?
                                YA RLY
                                    VISIBLE "BOO, IZ NO FIBONACCI NUM!"
                                    GTFO
                                NO WAI
                            OIC
                            GTFO
                        NO WAI
                    OIC
                NO WAI
            OIC

            Fibo1 R SUM OF Fibo1 AN Fibo2
            Fibo2 R SUM OF Fibo1 AN Fibo2

        IM OUTTA YR Nums

    IF U SAY SO

    I HAS A Num
    I HAS A MaxNum ITZ 50
    Num R I IZ GetNum MKAY
    Num IS NOW A NUMBR

    I IZ ProovFibo YR Num MKAY

KTHXBYE

BOTH SAEM Fibo2 AN BIGGR OF Num AN Fibo2
O RLY?
    YA RLY
        DIFFRINT Num AN Fibo1, O RLY?
            YA RLY
                DIFFRINT Num AN Fibo2, O RLY?
                    YA RLY
                        VISIBLE "BOO, IZ NO FIBONACCI NUM!"
                        GTFO
                    NO WAI
                OIC
                GTFO
            NO WAI
        OIC
    NO WAI
OIC

equals this pseudo code

if (Fibo2 >= max(Num, Fibo2))
{
    then
        if (Num != Fibo1) {
            then
                if (Num != Fibo2) {
                    then
                        print "BOO, IZ NO FIBONACCI NUM!"
                        break
                    else
                }
                break
            else
        }
    else
}

Basically, what you've made has some strange bits.

Let's clean it up.

if (Fibo2 >= max(Num, Fibo2))//weird check, replace with Fibo2 > Num instead
{
    then
        if (Num != Fibo1) {
            then
                if (Num != Fibo2) {
                    then
                        print "BOO, IZ NO FIBONACCI NUM!"
                        break
                    else//remove useless else
                }
                break
            else//remove useless else
        }
    else//remove useless else
}

if (Fibo2 > Num) {
then
    if (Num != Fibo1) { 
    then
        if (Num != Fibo2) { 
        then
            print "BOO, IZ NO FIBONACCI NUM!"
            break
        }
        break
    }
}

Huh. Well, we don't need a double break.

if (Fibo2 > Num) {
then
    if (Num != Fibo1) { 
    then
        if (Num != Fibo2) { 
        then
            print "BOO, IZ NO FIBONACCI NUM!"
        }
        break
    }
}

Well, neither of these two can be true, due to the way your algorithm works (you do a check for Fibo1 == Num and Fibo2 == Num to determine if it is a fibonacci number). Remove the unneeded checks.

if (Fibo2 > Num) {
then
    print "BOO, IZ NO FIBONACCI NUM!"
    break
}

And translate back to LOLCODE.

DIFFRINT Fibo2 AN SMALLR OF Fibo2 AN Num
O RLY?
YA RLY
    VISIBLE "BOO, IZ NO FIBONACCI NUM!"
    GTFO
OIC

Well, that simplified things!

Indentation

I still don't like the indentation, though. Three lines for a single if statement?
Let's combine them:

DIFFRINT Fibo2 AN SMALLR OF Fibo2 AN Num
O RLY?, YA RLY
    VISIBLE "BOO, IZ NO FIBONACCI NUM!"
    GTFO
OIC

This is the minimum I'd do. Even shorter would be:

DIFFRINT Fibo2 AN SMALLR OF Fibo2 AN Num, O RLY?, YA RLY
    VISIBLE "BOO, IZ NO FIBONACCI NUM!"
    GTFO
OIC

But then we're basically having the brace-style argument again; Put them on a new line or on the next?

LOLCODE internal workings

I confused myself a couple times during the writing of this answer.

For instance, you had a BOTH SAEM Fibo2 AN BIGGR OF Num AN Fibo2 check, but this is what the spec says:

BOTH SAEM  AN BIGGR OF  AN    BTW x >= y
BOTH SAEM  AN SMALLR OF  AN   BTW x  AN SMALLR OF  AN    BTW x > y
DIFFRINT  AN BIGGR OF  AN     BTW x < y

And you have BOTH SAEM AN BIGGR OF AN . So what is your version going to do?

Well, if we split it into two statements...

BIGGR OF  AN    BTW Math.max(x, y)
SMALLR OF  AN   BTW Math.min(x, y)
I HAZ A RESULT ITZ BIGGR OF  AN   BTW RESULT = Math.max(x, y)
BOTH SAEM  AN RESULT  BTW x = Math.max(x, y)

Apparently DIFFRINT Fibo2 AN SMALLR OF Fibo2 AN Num is what you need. It basically checks if "the smaller of Fibo2 and Num" is "Fibo2".

StackExchange Code Review Q#79304, answer score: 46