parseInt quadratic equation

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:

  int a, b, c;
  Serial.print("Enter a: ");
  while (Serial.available() == 0) ;
  a = Serial.parseInt();
  Serial.println(a);
  Serial.print("Enter b: ");
  while (Serial.available() == 0) ;
  b = Serial.parseInt();
  Serial.println(b);
  Serial.print("Enter c: ");
  while (Serial.available() == 0) ;
  c = Serial.parseInt();
  Serial.println(c);
  Serial.println();

  int x1 = (-b + sqrt(b * b - 4 * a * c)) / (2 * a);
  int x2 = (-b - sqrt(b * b - 4 * a * c)) / (2 * a);

  Serial.print("x1=");
  Serial.println(x1);
  Serial.print("x2=");
  Serial.println(x2);
  Serial.println("******************************************");
}