/*
  Purpose: find the minimum and maximum values of an array of 
    data values
  
  Dr. Purdum, August 13, 2012
 */
#include <stdio.h>
#define READINGSPERDAY 24
#define VERYHIGHTEMPERATURE 200
#define VERYLOWTEMPERATURE -200

int todaysReadings[] = {62, 64, 65, 68, 70, 70, 71, 72, 74, 75, 76, 78,
               79, 79, 78, 73, 70, 70, 69, 68, 64, 63, 61, 59};
void setup() {                
  // So we can communicate with the PC
  Serial.begin(9600);   
}

void loop() {
  int lowTemp;
  int hiTemp;
  int retVal;

  Serial.println("=== Before function call:");
  Serial.print("The lvalue for lowTemp is: ");  
  Serial.print((long) &lowTemp, DEC);
  Serial.print(" and the rvalue is ");
  Serial.println((long) lowTemp, DEC);
  Serial.print("The lvalue for hiTemp is: ");  
  Serial.print((long) &hiTemp, DEC);
  Serial.print(" and the rvalue is ");
  Serial.println((long) hiTemp, DEC);
  
  retVal = CalculateMinMax(todaysReadings, &lowTemp, &hiTemp);
  Serial.println("=== After the function call:");
  Serial.print("The lvalue for lowTemp is: ");  
  Serial.print((long) &lowTemp, DEC);
  Serial.print(" and the rvalue is ");
  Serial.println((long) lowTemp, DEC);
  Serial.print("The lvalue for hiTemp is: ");  
  Serial.print((long) &hiTemp, DEC);
  Serial.print(" and the rvalue is ");
  Serial.println((long) hiTemp, DEC);
  Serial.println("\n");

  Serial.flush();  // Make sure all the data is sent...
  exit(0);

}/*****
	Purpose: Get the daily temperature reading (READINGSPERDAY) and 
		set the minimum and maximum temperatures for the day.
	Parameter list:
               int temps[]                   the array of temperatures
		int *minTemp		pointer to the minimum temperature value
		int *maxTemp		pointer to the maximum temperature value

	Return value:
		int			the number of readings processed
*****/
int CalculateMinMax(int temps[], int *minTemp, int *maxTemp)
{
   int j;
   *minTemp = VERYHIGHTEMPERATURE;	// Make the minimum temperature ridiculously high
   *maxTemp = VERYLOWTEMPERATURE;  // Make the maximum temperature ridiculously low
   for (j = 0; j < READINGSPERDAY; j++) {
      if (temps[j] >= *maxTemp) {
	*maxTemp = temps[j];
      }
      if (temps[j] <= *minTemp) {
      	*minTemp = temps[j];
      }
   }
   return j;
}