642: Mainline

Accordingly, you should keep just one conditionalized file. To produce the different versions you want, you need only to retain or eliminate the definition of VERBOSE, as in the following example:

/* 
Define VERBOSE if you want two complete sentences. 
Do not define VERBOSE if you want two numbers only. 
*/ 
#define VERBOSE 
#include   
/* Define the trade structure */ 
struct trade {double price; int number;}; 
/* Define auxiliary functions */ 
double mean_price (struct trade **array, int length) { 
  int counter; double sum = 0.0;  
  for (counter = 0; counter < length; ++counter) 
    sum = sum + array[counter] -> price; 
  return sum / counter; 
} 
double mean_size (struct trade **array, int length) { 
  int counter; double sum = 0.0;  
  for (counter = 0; counter < length; ++counter) 
    sum = sum + array[counter] -> number; 
  return sum / counter; 
} 
/* Define trade array */ 
struct trade *trade_pointers[100]; 
main ( ) { 
  /* Declare various variables */ 
  int limit, counter, number; 
  double price; 
  /* Read numbers from the file and stuff them into array */ 
  for (limit = 0; 
       2 == scanf ("%lf%i", &price, &number); 
       ++limit) { 
    trade_pointers[limit]  
      = (struct trade*) malloc (sizeof (struct trade)); 
    trade_pointers[limit] -> price = price; 
    trade_pointers[limit] -> number = number; 
  } 
  /* Perform analysis */ 
#ifdef VERBOSE 
    printf ("The mean price per share of the trades is %.2f.\n", 
            mean_price (trade_pointers, limit)); 
    printf ("The mean number of shares traded is %.0f.\n", 
            mean_size (trade_pointers, limit)); 
#else 
    printf ("%.2f %.2f",  
            mean_price (trade_pointers, limit), 
            mean_size (trade_pointers, limit)); 
#endif 
}