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

   1  #include <stdio.h>
   2
   3  float average_value(int a, int b)
   4  {
   5     return((a + b) / 2.0);
   6  }
   7
   8  int main(void)

   9  {

  10     printf("The average value is: %f\n", average_value(5, 10));
  11
  12     return 0;
  13  }
  14

[user02@FC4 Lesson10]$ gcc -o getave getave.c
[user02@FC4 Lesson10]$ ./getave
The average value is: 7.500000
[user02@FC4 Lesson10]$