In C++, the default function call method depends on the type of object or function being called. There are two main scenarios to consider:

1. Function Calls: When calling a regular function (not a member function of a class), the default method is known as “call by value.” This means that the arguments passed to the function are copied into the function’s parameters, and any modifications made to the parameters within the function do not affect the original arguments. The return value, if any, is typically passed back to the caller.
2. Member Function Calls: When calling a member function of a class or object, the default method is known as “call by reference” or “call by pointer.” In this case, the function is called on an object, and the function has access to the object’s data members and can modify them if necessary. This method allows the function to operate directly on the object without making a copy.

It’s important to note that in C++, you can explicitly specify different calling conventions using references, pointers, or keywords like const and & to control how arguments are passed to functions. However, the default behavior described above is what you’ll encounter when no explicit calling convention is specified.