Plz can some1 explain the for i: 0..maxx by 20 command 2 me

[ruscutie]

i am doing turing for the first time at school and i don't really get the for i command in graphics. like in the following program wats the use of for i

for i : 0 .. maxx by 20
drawline(maxx-i , 0, maxx, maxy - i, 16)
end for

plz explain it 2 me
thanx

[Cervantes]

Try running the following code:

code:

for i : 0 .. maxx by 20     put i end for

Now you'll see the values that `i' can take on. Then sub those values into your expressions for drawline and see what comes out. Look for patterns.

[ruscutie]

thanx