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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_t93p31gqibnp7gauh3q34b27jm, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
sclass Average {
  double sum, n;
  
  void add(double d) {
    ++n;
    sum += d;
  }
  
  void add(double d, double weight) {
    n += weight;
    sum += d*weight;
  }
  
  double get() {
    ret doubleRatio(sum, n);
  }
  
  double n() { ret n; }
  
  toString { ret get() + " (n=" + n + ")"; }
  
  void clear {
    n = 0;
    sum = 0;
  }
}