const float numbers[] = 
{
  10.0, 100.0, -123.0, 560.3, 3.5, 7.123456, 0.0, -10.5, 
};

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

  // find min
  float min = numbers[0];
  for( auto a:numbers)      // "range based" for-loop
    if( a < min)
      min = a;

  // find max
  float max = numbers[0];
  for( auto a:numbers)
    if( a > max)
      max = a;

  Serial.print( "Minimum = ");
  Serial.println( min);
  Serial.print( "Maximum = ");
  Serial.println( max);
}

void loop() 
{
}