Programming Fundamentals

In C, the colon syntax in a struct declaration defines a bit-field. The integer x : 4 specifies that x will occupy exactly 4 bits of storage.

The stdarg.h header file provides the macros (va_list, va_start, va_arg, va_end) necessary to handle functions with a variable number of arguments.

The standard C implicit type conversion hierarchy (integer promotion and usual arithmetic conversions) is: int < unsigned < float < double.

In C++, destructors are special member functions used to clean up objects. They are defined without parameters and cannot be overloaded, meaning they always take zero arguments.

Passing by reference creates a direct link between the formal parameter and the actual argument. Any changes made to the formal parameter inside the function directly affect the original variable.

In C++, an array is a collection of elements of the same data type stored in contiguous memory locations. It cannot store mixed data types.

A pointer is a variable that holds the memory address of another variable, rather than holding a direct data value like an integer or float.

A union is a special data type that allows storing different data types in the same memory location, where only one member can contain a value at any given time.

Function overloading occurs when multiple functions have the same name but different parameter lists (different number or types of arguments). Option A changes the number of arguments, which is a valid overload.

In C, 'main' is the name of the function where program execution begins; it is an identifier, not a reserved keyword.

In C, an object is a region of data storage in the execution environment, the contents of which can represent values. Variables are the most common examples of objects.

In BASIC programming, the LET statement is used to assign a value to a variable.