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Why there is a function called strcat and not a function called stringConcatenation, or stringConcat or string_concat or something like that? Why there is a clrscr function and not clearScreen or clear_screen?
Does it have something to do with source code size in past days, where every byte was worth gold on overly-sized floppy disks? Or is this fueled by programmers’ inherent laziness? Is it a convention?
This is partly historical.
In very old C compilers, there was no guarantee that more than the first 8 characters of an identifier name would be used to determine uniqueness. This meant that, originally, all identifiers had to be eight or fewer characters, so method names were all made short.
For details, see Identifiers in the C Book.