nSuppose there is a data file PaintData.txt with the following contents:
ncircle
100 100 20
n rectangle 40 40 90 80
n rectangle 140 140 190 180
n circle 200 200 50
nThe first
column in each line is a label.
nIf the label
is equal to “circle”, then the following data in this line are xcenter,
ycenter and radius for painting a circle.
nIf the label
is equal to “rectangle”, then the following data in this line are x1,
y1, x2 and y2 for painting a rectangle.
nRead all the
data from the file and paint either circls or rectangle according to
the corresponding labels.