第12/31課：使用Arduino程式設計函數同開關 | SunFounder Robojax

/*
This sketch demonstrates the Arduino programming : function
Download and resource page https://robojax.com/RJT595
watch video https://www.youtube.com/watch?v=JLF7FQeVlkY
*/

const float voltage = 3.3;

void setup() {
   // Robojax Arduino floating points
  Serial.begin(9600);// initialize the Serial Monitor
}




void loop() {
  //3.141592
  Serial.println(    pi(), 10  );
  

  //delay(1000);
    
}

/*
  printText: prints the text on Serial monitor
  
  @param t is String text
  @ returns nothing
 */
void printText(String t)
{

   Serial.println(t);                   
}


/*
 * getDays is calculation the number of days in a year
 * @param a is integer 
 * @param returns integer value of number of days
 */
int getDays(int a)
{
  return (a * 365);// multiply  a by 365 to get number of days and return it
}






float getArea(float l, float w)
{
  float area = l * w;
  return area;
}







String makeText(double temperature)
{
  String newText;
   if (temperature > 60.5)
   { 
    newText = "Very hot";
   }else{
    newText = "Not hot";
   }
   return newText;
}





double pi()
{

  double p = 3.141592;// 6 decimal points
  return p;// returns value of pi
}








float getPower(float i)
{
  return i*voltage;// 
}