On his honeymoon in 1961, Knuth discovered that the roads of mathematics and computer programs intersect. For, Jill was not only accompanied by her newly wed husband on their joint trip through Europe, but also by Noam Chomsky's book Syntactic Structures which Knuth was studying eagerly. Chomsky showed Knuth how mathematics and computing can be practiced together. One year later, Knuth met Bob Floyd who would teach him that you really could use mathematical reasoning to understand computer programs. The early sixties thus not only brought Jill and Don Knuth officially together, it also married mathematics and programming.

#include <stdio.h>

int main() {
    char input[100];

    while (fgets(input, sizeof(input), stdin)) {
        printf("%s", input);
    }

    return 0;
}

use std::io::{self, Write};

fn main() {
    let mut input = String::new();
    while io::stdin().read_line(&mut input).unwrap() > 0 {
        print!("{}", input);
        input.clear();
    }
}

: repl
  BEGIN
    TIB DUP >IN !
    0 WORD COUNT TYPE
  AGAIN ;

main :: IO ()
main = do
    input <- getLine
    putStrLn input
    main

(loop (print (eval (read))))

The problem is that coding isn’t fun if all you can do is call things out of a library, if you can’t write the library yourself. If the job of coding is just to be finding the right combination of parameters, that does fairly obvious things, then who’d want to go into that as a career?