Fortran, really.

In Fortran, variables beginning with the letters i through n have integer type by default, whereas all other letters imply a real-number (floating-point) variable. You can change this by declaring a type, but using i for a real is non-obvious.

(Hence the old joke, "God is real — unless declared integer.")

in programming, and in mathematics, it's always been weird to me that frequently paired variables are basically the most easily confused for one another pairs, especially when written quickly or sloppily.

• i and j
• x and y
• m and n

I always like to joke in coding interviews that I really like to make variable names as long as I can so they are very precisely named. Then when I get to a double nested loop I hit them with iterator and jiterator instead of I and j

Unless they're indices, do yourself a favor and use meaningful names instead.

I avoid index iterations the most I can tbh. And for nested loops,i and k is more readable.

i for index or iteration. Using j, k, l... in loops signals (imho) that there is most likely an outer loop and the one using j, k, l are nested. x and y of course are carthesian coordinates . n is used as amount of substance in SI-unit-system, m is mass, maybe thats why it is used as amount of items in a set (Menge).

Programming computers have started to solve mathematical problems and math already used these symbols for centuries(?), so why you should change them? They are well established even in simple school mathematics. And at the end of the day a computer is nothing more than a calculator.

x = "Am I a joke to you?";

I haven't used I and J after college

Hi there! Your text contains links to other Lemmy communities, here are correct links for Lemmy users: !programmerhumor@lemmy.ml

Usually variables like that can be avoided with itterators nowadays. If they can’t I like to use idx, if they are nested I name them after what they index, like idx_rows, idx_cols.

I prefer to use K in for loops, but that's just me.