In many cases, functions have arguments that are used so infrequently that a default value would suffice.
Function with default arguments in C++ - C ++ Tutorial - Mr. Kishore
To address this, the default-argument facility allows for specifying only those arguments to a function that are meaningful in a given call. To illustrate this concept, consider the example presented in Function Overloading. In many applications, a reasonable default can be supplied for prec , eliminating the need for two functions:.
The implementation of the print function is changed slightly to reflect the fact that only one such function exists for type double :. Default arguments are used only in function calls where trailing arguments are omitted — they must be the last argument s.
Therefore, the following code is illegal:. A default argument cannot be redefined in later declarations even if the redefinition is identical to the original.
Therefore, the following code produces an error:. The problem with this code is that the function declaration in the definition redefines the default argument for prec. Skip to main content. Exit focus mode.
Recent from our blog
Theme Light Dark High contrast. Profile Bookmarks Collections Sign out.
Note these points when using default arguments: Default arguments are used only in function calls where trailing arguments are omitted — they must be the last argument s.
Additional default arguments can be added by later declarations.
Default arguments can be provided for pointers to functions. Yes No.
Beginner Friendly Tutorials for Programmers
Any additional feedback? Skip Submit. Send feedback about This product This page. You may also leave feedback directly on GitHub.
This page. Submit feedback.
There are no open issues. View on GitHub. Is this page helpful?