/**
 * Modulo. 
 * 
 * The modulo operator (%) returns the remainder of a number 
 * divided by another. As in this example, it is often used 
 * to keep numerical values within a set range. 
 */

int num = 0;

void setup()
{
  Serial.begin(9600);
}

void loop() 
{ 
  num = (num+1)%10;  // num goes from 0 to 9
  Serial.print(num, DEC);
  Serial.print(" ");
} 


