What's the joke in the Stack Overflow 404 page code?

I have journeyed thus and bruised into the lands of the error page on Stack Overflow. There, upon the hill I see a vision as such: For those reading with images off: # define v putchar # define print(x) main(){v(4+v(v(52)-4));return 0;}/* #>+++++++4+[>++++++<-]>++++.----.++++.*/ print(202*2);exit(); #define/*>.@*/exit() How can I compile it? More to the point, what is the joke?

[fenrir-naru]

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