Quadratic equation in Scala

import java.io.{BufferedReader, InputStreamReader}
 
object Main {
    def main(args: Array[String]) {
        var stdin = new BufferedReader(new InputStreamReader(System.in));
        var A = augmentString(stdin.readLine()).toInt;
        var B = augmentString(stdin.readLine()).toInt;
        var C = augmentString(stdin.readLine()).toInt;
        solve(A,B,C);
    }
    def output(real: Double, imag: Double): String = 
        if (imag == 0) ""+real
                  else "("+real+","+imag+")"
 
    def solve(A: Int, B: Int, C: Int)
    {   if (A == 0) print("Not a quadratic equation.")
        else
        {   def D = B*B - 4*A*C;
            if (D == 0) print("x = "+output(-B/2.0/A, 0));
            else if (D > 0) 
                      print("x1 = "+output((-B+Math.sqrt(D))/2.0/A, 0)+"\nx2 = "+output((-B-Math.sqrt(D))/2.0/A, 0));
                 else print("x1 = "+output(-B/2/A, Math.sqrt(-D)/2.0/A)+"\nx2 = "+output(-B/2/A, -Math.sqrt(-D)/2.0/A));
        }
    }
}