What's the difference between these two function declarations in C/C++?

Question

return_type function(arg_type * arg);
return_type function(arg_type &arg);
What's the difference between these two declarations?

Answer 1

Note that it's not 'C/C++'. The second declaration is NOT valid in C, it is only valid in C++.

Answer 2

Also, you have 3 questions with the same content. Please delete the other 2 as they are duplicates
https://sololearn.com/discuss/2749239/?ref=app
https://sololearn.com/discuss/2749237/?ref=app

Answer 3

Sorry for the duplicates. SL was acting all weird.