Default Arguments

• Functions may supply default values for some or all of their parameters
• Start with the last parameter and work backwards
• The default argument may be placed in either the prototype or the header (part of the implementation), but not both
• Default argument values used in standard libraries as well as user-defined functions
• Arguments are substituted until exhausted, then default values are used

int next ( int x , int y  = 1 , int z = 0 )
{
  return (x + y - z);
}

int main()
{
  int m, n;
  m = 10;
  n = next(m);     // n = 11 = 10 + 1 - 0
  n = next(m,2);   // n = 12 = 10 + 2 - 0 
  n = next(m,2,3); // n =  9 = 10 + 2 - 3
}