Feb 19, 2024 · In this article, we will learn how to use default arguments in function overloading in C++. We can define the default value in function overloading as we do it in the main function.

Often you have a function that uses default values, but occasionally you want to override the defaults. Default parameters allow an easy way to do this without having to define many functions for the rare exceptions.

In this tutorial, we will learn about function overloading in C++ with examples. Two or more functions having the same name but different parameters are known as function overloading.

Nov 19, 2018 · A candidate function having more than m parameters is viable only if the (m+1)-st parameter has a default argument (11.3.6). For the purposes of overload resolution, the parameter list is truncated on the right, so that there are exactly m parameters.

Nov 28, 2012 · No gotcha if an overriding function uses a different value for its default. It's not necessary to add "hacky" constructors to existing types in order to allow them to have default. Output parameters can be defaulted without needing to use pointers or hacky global objects.

Mar 4, 2025 · Overloading functions with default arguments can sometimes lead to ambiguities. It increases the execution time as the compiler needs to replace the omitted arguments by their default values in the function call.

Jan 11, 2025 · Function overloading can be considered as an example of a polymorphism feature in C++. If multiple functions having same name but parameters of the functions should be different is known as Function Overloading. If we have to perform only one operation and having same name of the functions increases the readability of the program.

You can also use a default parameter value, by using the equals sign (=). If we call the function without an argument, it uses the default value ("Norway"): A parameter with a default value, is often known as an " optional parameter ". From the example above, country is an optional parameter and "Norway" is the default value.

In this tutorial, you will learn the fundamentals of default arguments in C++, including their definition, how to use them, and their role in function overloading. You will also explore best practices for implementing default arguments, common pitfalls to avoid, and practical examples demonstrating their application. Contents:

Function overloading provides for declaration using same name of functions that perform similar tasks but on different data types. The compiler is able to select the appropriate function by examining the types, number and arguments used in the call.