Within C you could not provide default values for function parameters. Well, C++ has come to your rescue.
#include <iostream.h> void Func( int one, int two=2, int three=3); main () { Func(10, 20, 30); Func(10, 20); // Let the last parm default Func(10); // Just provide the required parm. } void Func( int one, int two, int three) { cout << "One = " << one << endl; cout << "Two = " << two << endl; cout << "Three = " << three << endl << endl; } |
From this example, you can see that the prototype/function declaration gives default values for the second and third parameters. It is now down to the programmer calling the function to decide how many s/he wants to provide.
There are some basic rules that should be applied when using default parameter values.
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