Can any one help me on this?

Question

Please help me to solve this.
https://code.sololearn.com/cgQM317NwzSm/?ref=app

Answer 1

line 27 should be like that:
thread t1(fun<char, 1000>, std::ref(a));

Tip: what you are passing as a template argument to fun is an array of references and that's not a legal type in C++, just as pointers to references and references to references are prohibited ( C++ Standard §8.3.2/4).

Answer 2

Mohamed ELomari thanks