what is the diffrence between b and bf option used with line systme What is the difference between B and BF option

The line statement is used in graphic screen modes to create
lines or boxes.

B option

1. B option creates a rectangle using the start and end
coordinates as diagonal corners. It creates a box outline with each side
parallel to the program screen sides.

2. It is possible to use B with a style% to draw the
rectangle outline using the desired pattern.

BF option

1. BF creates a filled box.
2. It ignores the style% parameter.