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Question from "Test the Whiskers" — Parallax Forums

Question from "Test the Whiskers"

parkerparkourparkerparkour Posts: 7
in Learn with BlocklyProp
Hello,
I am following a series of tutorials by Parallax to program my Activitybot. In the Test the Whiskers tutorial there is the following assignment:

Write a for loop with a print call that uses CRSRXY to create this output:

Whisker-your-turn.png

I would really appreciate help with what the code should look like, I am a little stuck. Thanks!
Whisker-your-turn.png
431 x 312 - 24K

Comments

  • tomcrawfordtomcrawford Posts: 1,126
    Which part don't you understand?

    How to write a FOR/NEXT loop? On page 21, Go to the StartSimple tutorial and try the programming examples, then come back here when you are done.

    How to use print? Look at the previous project.

    how to use CRSRXY? Study the table on the previous page and look at the example.
  • parkerparkourparkerparkour Posts: 7
    tomcrawford wrote: »
    Which part don't you understand?

    How to write a FOR/NEXT loop? On page 21, Go to the StartSimple tutorial and try the programming examples, then come back here when you are done.

    How to use print? Look at the previous project.

    how to use CRSRXY? Study the table on the previous page and look at the example.

    Thanks for the response. I think I understand how to use a for loop, a print command, and CRSRXY. What's stumping me is how to combine the components to display the numbers as shown in the picture.

  • tomcrawfordtomcrawford Posts: 1,126
    Think of the screen as an X-Y grid. Observe that the characters are sort of in a diagonal line with a slope of 1. You will have two print statements inside the loop; one to set the cursor X, Y and one to print a single character (1...9).
  • parkerparkourparkerparkour Posts: 7
    tomcrawford wrote: »
    Think of the screen as an X-Y grid. Observe that the characters are sort of in a diagonal line with a slope of 1. You will have two print statements inside the loop; one to set the cursor X, Y and one to print a single character (1...9).

    Will do. Thanks!
  • GenetixGenetix Posts: 1,754
    parkerparkour,

    I would start with the "Try This" example and make changes to it.
    As Tom pointed out, what do you notice about the positions for each line? How are they related?
    Also, do you see a pattern between the positions and the printed line number?

    The upper-left corner of the screen is position 0,0 and increasing values move the cursor towards the lower-right corner.
  • parkerparkourparkerparkour Posts: 7
    Genetix wrote: »
    parkerparkour,

    I would start with the "Try This" example and make changes to it.
    As Tom pointed out, what do you notice about the positions for each line? How are they related?
    Also, do you see a pattern between the positions and the printed line number?

    The upper-left corner of the screen is position 0,0 and increasing values move the cursor towards the lower-right corner.

    Great. Thanks.
  • parkerparkourparkerparkour Posts: 7
    Genetix wrote: »
    parkerparkour,

    I would start with the "Try This" example and make changes to it.
    As Tom pointed out, what do you notice about the positions for each line? How are they related?
    Also, do you see a pattern between the positions and the printed line number?

    The upper-left corner of the screen is position 0,0 and increasing values move the cursor towards the lower-right corner.

    I tried this (see photo) and did not get the right result. I know I am missing something, most likely with the cursor positioning. Any ideas? Thanks!
    screenshot for loop.png
    screenshot for loop.png
    1366 x 768 - 129K
  • twm47099twm47099 Posts: 867
    parkerparkour wrote: »
    Genetix wrote: »
    parkerparkour,

    I would start with the "Try This" example and make changes to it.
    As Tom pointed out, what do you notice about the positions for each line? How are they related?
    Also, do you see a pattern between the positions and the printed line number?

    The upper-left corner of the screen is position 0,0 and increasing values move the cursor towards the lower-right corner.

    I tried this (see photo) and did not get the right result. I know I am missing something, most likely with the cursor positioning. Any ideas? Thanks!
    screenshot for loop.png

    To match the screen shot in the first post you want to position the cursor at column 0, row 1 (remember the upper right corner is 0,0) and print the number 1.

    Next you want to position the cursor at column 1, row 2 and print 2. Repeat for numbers up to and including 9.

    What you program in the last post is doing is print 1 in column 0, row 0.
    Then position the cursor in column 1, row 1 and print n. Each value of n (1 through 9) prints at 1,1 overwriting the previous number. You need to fix the arguments of the cursor positioning function.

    I would also print n after positioning the cursor (move the n print statement below the cursor statement.

    Give it a try, and if you still have problems let us know.

    Tom


  • GenetixGenetix Posts: 1,754
    parkerparkour,

    Very good job but you forgot something.

    Look at the position values in the second print statement.
  • parkerparkourparkerparkour Posts: 7
    Genetix wrote: »
    parkerparkour,

    Very good job but you forgot something.

    Look at the position values in the second print statement.

    I fixed the position values and it worked. Thanks for the help!
  • parkerparkourparkerparkour Posts: 7
    twm47099 wrote: »
    parkerparkour wrote: »
    Genetix wrote: »
    parkerparkour,

    I would start with the "Try This" example and make changes to it.
    As Tom pointed out, what do you notice about the positions for each line? How are they related?
    Also, do you see a pattern between the positions and the printed line number?

    The upper-left corner of the screen is position 0,0 and increasing values move the cursor towards the lower-right corner.

    I tried this (see photo) and did not get the right result. I know I am missing something, most likely with the cursor positioning. Any ideas? Thanks!
    screenshot for loop.png

    To match the screen shot in the first post you want to position the cursor at column 0, row 1 (remember the upper right corner is 0,0) and print the number 1.

    Next you want to position the cursor at column 1, row 2 and print 2. Repeat for numbers up to and including 9.

    What you program in the last post is doing is print 1 in column 0, row 0.
    Then position the cursor in column 1, row 1 and print n. Each value of n (1 through 9) prints at 1,1 overwriting the previous number. You need to fix the arguments of the cursor positioning function.

    I would also print n after positioning the cursor (move the n print statement below the cursor statement.

    Give it a try, and if you still have problems let us know.

    Tom


    It worked. Thanks!
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