Default Parameter

Default Parameter Value

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"):

Example

void myFunction(string country = "Norway") {
  cout
<< country << "\n";
}

int main() {
  myFunction("Sweden");

myFunction("India");
  myFunction();

myFunction("USA");
  return 0;
}

// Sweden
//
India
// Norway
// USA

Note: 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.