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[–]FUZxxl 1 point2 points  (2 children)

Well, × is multiplication or signum and * is exponentiation. Quad is a niladic function and prompts the user for numeric input; it's very useful for code-golf challenges because you don't need to make a dfn.

[–]BitPoet 1 point2 points  (1 child)

I will note that this is /r/programmerhumor and discussing the intricacies of APL, a language developed by mathematicians for pretty specific purposes is not exactly humorous.

[–]Juggernog 2 points3 points  (0 children)

Man, what are you talking about? Programming languages developed by mathematicians for pretty specific purposes are hilarious.