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The Massachusetts General Hospital Utility Multi-Programming System, abbreviated as MUMPS or just M, is a programming language that is absolutely unique in its shittiness. Unfortunately, although it's constructed as one of those shit esoteric languages like Brainfuck or Befunge, people actually use it.
—Alex Papadimoulis, writing for The Daily WTF
A Hello World program in MUMPS looks like this:
hello() write "Hello, World!",! quit
As TOW explains, the
,! part creates a newline for reasons that are totally obvious. The
quit part is necessary because the MUMPS compiler doesn't give a fuck about whether or not you want a routine to end. This is also painfully apparent in the very short routine size limit, which forces most MUMPS programs to consist of a bunch of routines like
ASDF3, all chained together with
hello() w "Hello, World!",! q
This last program takes advantage of the fact that you can abbreviate keywords like
if in one letter, like
i. So does this one, which prints out a beautifully formatted table of prime numbers:
f p=2,3:2 s q=1 x "f f=3:2 q:f*f>p!'q s q=p#f" w:q p,?$x\8+1*8
—Steve J. Morris, as quoted in the MUMPS FAQ, part 1
The data type he's talking about is the string, which is the ONLY data type in MUMPS. That's right: strings are implicitly converted into numbers while performing mathematical operations.
Speaking of mathematical operations, unlike every other language on the planet, MUMPS evaluates everything left to right. So, in the world of MUMPS, 2 + 3 * 10 is equal to 5 * 10, not 2 + 30.
Other fun things include the keywords. MUMPS doesn't have any. So this shit:
GREPTHIS() NEW SET,NEW,THEN,IF,KILL,QUIT SET IF="KILL",SET="11",KILL="l1",QUIT="RETURN",THEN="KILL" IF IF=THEN DO THEN QUIT:$QUIT QUIT QUIT ; (quit) THEN IF IF,SET&KILL SET SET=SET+KILL QUIT
is perfectly valid MUMPS code. But wait! There's more! We haven't even talked about multi-threading and networking yet. Yes, this steaming puddle of afterbirth does indeed support those features. To access a database (or, an array - in MUMPS, they're the exact same thing, but databases have a ^ in front) on another machine, all you need to do is:
to set the 1000th element of the database A on the machine named DENVER to "Foo".
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