// Program: Ex4A_Loop.ino
/*
   Exercise 4A Loop
*/

void setup()
{
  Serial.begin(115200);
}

void loop()
{
  int i, j;

  // Looping Example 1
  Serial.print("for      loop example 1: i = ");
  for (i = 0; i < 10; i++)
  {
    Serial.print(i);
    Serial.print(" ");
  }
  Serial.println();

  // Looping Example 2
  Serial.print("while    loop example 2: i = ");
  i = 0;
  while (i < 10)
  {
    Serial.print(i);
    Serial.print(" ");
    i++;
  }
  Serial.println();

  // Looping Example 3
  Serial.print("do while loop example 3: i = ");
  i = 0;
  do
  {
    Serial.print(i);
    Serial.print(" ");
    i++;
  }
  while (i < 10);
  Serial.println();
  Serial.println();

  // Example application: factorial calculation
  Serial.println("Example of loop: factorial calculation");
  Serial.print("10! = ");
  for (i = 10, j = 1; i > 0; i--)
  {
    j = j * i;
  }
  Serial.println(j);
  Serial.println();

  // Example application: a list of factorial calculations (loop inside loop)
  Serial.println("Example of loop in loop: list of factorial calculations");
  for (int k = 1; k < 10; k++)
  {
    Serial.print(k);
    Serial.print("! = ");
    for (i = k, j = 1; i > 0; i--)
    {
      j = j * i;
    }
    Serial.println(j);
  }

  while (1);
}