Quadratic equation in Basic

Example for versions QuickBASIC 4.5 
PRINT "A = "
INPUT A
IF (A = 0) THEN
    PRINT "Not a quadratic equation."
ELSE
    PRINT "B = "
    INPUT B
    PRINT "C = "
    INPUT C
    D = B * B - 4 * A * C
    IF (D = 0) THEN
        PRINT "x = " + STR$(-B / 2! / A)
    ELSE
        IF (D > 0) THEN
            PRINT "x1 = " + STR$((-B + SQR(D)) / 2! / A)
            PRINT "x2 = " + STR$((-B - SQR(D)) / 2! / A)
        ELSE
            PRINT "x1 = (" + STR$(-B / 2! / A) + "," + STR$(SQR(-D) / 2! / A) + ")"
            PRINT "x2 = (" + STR$(-B / 2! / A) + "," + STR$(-SQR(-D) / 2! / A) + ")"
        END IF
    END IF
END IF