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Vector Parameters and Return Values (Vector Parameters)

• Functions and procedures often have vector parameters.

  double average(vector<double> v)
  {
     if (v.size() == 0) return 0;
     double sum = 0;
     for (int i = 0; i < v.size(); i++)
        sum = sum + v[i];
     return sum / v.size();
  }
  

• A vector can be passed by value or by reference.
• Pass by reference is used for modifying individual elements of the vector.

  void raise_by_percent(vector<double>& v, double p)
  {
     for (int i = 0; i < v.size(); i++)
        v[i] =v[i] * (1 + p / 100);
  }
  

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