Explaining the difference between a statement and an expression in c++

Question

I am trying to understand thoroughly the difference between a statement and an expression
But i am finding it confusing even after reading this answer

Answer 1

Which one is correct?

Both: it is an expression statement. C and C++ let you put an expression into a body of code, add a semicolon, and make it a statement.

Here are some more examples:

x++;       // post-increment produces a value which you could use
a = 5;     // Assignment produces a value
max(a, b); // Call of a non-void function is an expression
2 + x;     // This calculation has no side effects, but it is allowed

Note that this is true in the specific case of C and C++, but may not be true in case of other languages. For example, the last expression statement from the list above would be considered invalid in Java or C#.