In C++, the asterisk () is used as the multiplication operator. So, "a×b" is represented as "ab" in C++ programming.

The put() method is used to write a single character to a file stream in C++. The write() method is typically used to write blocks of binary data, while insert() and push() aren't standard methods for this purpose in C++ streams.

The const keyword is used in C++ to indicate that a value shouldn't be modified. When passing an argument by reference, using const before the parameter type ensures that the function does not alter the original data, providing a level of safety.

In C++, when an object's lifetime ends, its destructor is called automatically. A destructor is a member function with the same name as its class preceded by a tilde (~).

In recursive algorithms, the "recursive case" refers to the scenario or condition where the function calls itself. This is contrasted with the "base case", which provides a termination criterion for the recursion. Without a base case, recursive functions can run indefinitely, leading to a stack overflow. The recursive case helps break down the problem into smaller, more manageable sub-problems.

The private access specifier in C++ ensures that class members are only accessible within the class and not outside. Additionally, friend functions or classes can access these private members, but they remain hidden from other parts of the program.

Inside a for loop, the continue statement causes the loop to skip the rest of its body and jump immediately to the next iteration. This is particularly useful when certain conditions within the loop need to be avoided for specific iterations.

Inline functions are a suggestion to the compiler to insert the complete body of the function wherever that function is used in the code. This can improve efficiency by eliminating the overhead of a function call, potentially leading to faster runtime performance.

Passing parameters by reference gives a function direct access to the original data. This can be risky as inadvertent changes in the function can lead to unintended modifications to the data. Care must be taken to ensure the integrity of the data and to avoid unexpected side effects. This risk doesn't exist when passing parameters by value since the function works with a copy of the data.

Using curly braces { } in nested if-else structures ensures clear block demarcation, helping readers understand the scope and flow of the code. Without them, it's easy to misinterpret where conditions start and end, especially in deep nesting.