https://www.wikiwand.com/en/Functional_programming https://www.wikiwand.com/en/Functional_programming Read the first line: "In computer science, functional pr

https://www.wikiwand.com/en/Functional_programming https://www.wikiwand.com/en/Functional_programming Read the first line: "In computer science, functional programming is a programming paradigm—a style of building the structure and elements of computer programs—that treats computation as the evaluation of mathematical functions and avoids changing-state and mutable data. It is a declarative programming paradigm, which means programming is done with expressions[1] or declarations[2] instead of statements." Key phrase: "avoids changing-state and mutable data." You can use C++ as if it was a functional language just like you can use LISP and CaML as if variables were mutable. However in both cases you are bending the language to follow a paradigm that is NOT functional.