Passing an array to a function : function parameters « Function « C++ Tutorial

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2. Function
3. function parameters

#include <iostream>
using std::cout;
using std::endl;

double average(double array[], int count);    

int main() {
  double values[] = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0};

  cout << "Average = "
       << average(values, (sizeof values)/(sizeof values[0]))
       << endl;

  return 0;
}

double average(double array[], int count) {
  double sum = 0.0;                        
  for(int i = 0 ; i < count ; i++)
    sum += array[i];                       

  return sum/count;                        
}

Average = 5.5