A default argument is a parameter value assigned by the function definition if no corresponding argument is provided by the caller during function invocation. It allows a function to be called with fewer arguments, providing a default value for any missing ones.
This feature enhances code flexibility and reusability, as functions can cater to various scenarios without explicitly passing all parameters. To use default arguments, they are specified in the function prototype and defined in the function implementation. By understanding and utilizing default arguments, C++ developers can design more versatile functions and streamline their code effectively.
Advanced Level CPP Interview Questions