[user02@FC4 Lesson10]$ cat -n getave.cpp

   1  #include <iostream>
   2  using namespace std;
   3
   4  float average_value(int a, int b)
   5  {
   6     return((a + b) / 2.0);
   7  }
   8
   9  int main()
  10  {
  11     cout << "The average value is: " << average_value(5, 10) << endl;
  12
  13     return 0;
  14  }

[user02@FC4 Lesson10]$ g++ -o getave getave.cpp
[user02@FC4 Lesson10]$ ./getave
The average value is: 7.5
[user02@FC4 Lesson10]$