#include <stdio.h>
#include <stdlib.h>

enum skyColor {blue, orange, gray};    // Foregoes the use of typedef.

struct forecastStruct {                // Now the struct has a name. 
  double temperature;
  char *message;
};


// Return type needs both the "struct" keyword and the struct name.
// Parameter needs both the "enum" keyword and the enum name.

struct forecastStruct forecast (enum skyColor c)      
{
  // Pointer declaration without typedef.
  struct forecastStruct *fInfoPtr;

  // Note the full type specification for sizeof and the cast.
  fInfoPtr = (struct forecastStruct *) malloc (sizeof (struct forecastStruct) * 1);

  if (c == blue) {
    fInfoPtr->message = "Sunny and warm!";    // Note the use of the "->" operator
    fInfoPtr->temperature = 85.5;             // because fInfoPtr is a pointer.
  }
  else if (c == orange) {
    fInfoPtr->message = "Enjoy the sunset";
    fInfoPtr->temperature = 77.3;
  }
  else if (c == gray) {
    fInfoPtr->message = "Stay inside";
    fInfoPtr->temperature = 64.7;
  }

  return *fInfoPtr;                           // Return the struct itself, not the pointer.
}


int main ()
{
  // Example of struct variable declaration:
  struct forecastStruct fInfo;

  fInfo = forecast (blue);

  // Note the use of the "." operator to access struct members.
  printf ("Temperature = %lf: %s\n", fInfo.temperature, fInfo.message);
}