#include <stdio.h>

// Define an enum type and give it the name skyColorType:
typedef enum skyColor {blue, orange, gray} skyColorType;

// Define a type called "doublePointer":
typedef double *doublePointer;

// Define a string type:
typedef char *forecastString;


// This function takes a skycolorType and a doublePointer type
// as parameters and returns a string type.

forecastString forecast (skyColorType c, doublePointer temperature)
{
  forecastString str = "";

  if (c == blue) {
    str = "Sunny and warm!";
    *temperature = 85.5;        // Note: "temperature" is a pointer.
  }
  else if (c == orange) {
    str = "Enjoy the sunset";
    *temperature = 77.3;
  }
  else if (c == gray) {
    str = "Stay inside";
    *temperature = 64.7;
  }

  return str;
}

int main ()
{
  double temp;
  char *str;

  // Pass in a color and a pointer-to-double (the address), and
  // get back a string. The double "temp" gets modified in forecast.
  str = forecast (blue, &temp);

  printf ("Temperature = %lf: %s\n", temp, str);
}