What is the reasoning behind the naming of “lvalue” and “rvalue”?

Question

What is the reasoning behind the naming of \"lvalue\" and \"rvalue\" in C/C++ (I know how they function)?

Answer 1

In C, lvalue and rvalue reflect the usage in the assignment operator. rvalue can appear only to the right of =, while lvalue can be on either side. In C++ it's similar, but more complicated.

There are non-assignable lvalues, constant variables.