Buy him a copy of Donald Knuth's "The Art of Computer Programming": https://en.wikipedia.org/wiki/The_Art_of_Computer_Programming https://en.wikipedia.org/wiki/

Buy him a copy of Donald Knuth's "The Art of Computer Programming": https://en.wikipedia.org/wiki/The_Art_of_Computer_Programming https://en.wikipedia.org/wiki/The_Art_of_Computer_Programmin...