Scratch

what you just sed made no sense to me waht so ever   
im not good with scratch, i missed a few lessons due to sickness, when he was teaching variables and what not.
I need a more explanotiry write up lol i basically have no clue how to use the program, with the variables n sutff

newareagle wrote:

I should try to make a pretty advanced calculator sometime. It would be fun. If you used buttons instead of sliders it would act and look a lot better.

I tried once. It was hard. I actually had it all planned out with arrays for pretty big numbers, but than I forgot XD though it seems they arrays were working good!

I'll try to explain it from the very beginning, and without getting too technical... but this will just drag on.

First, open the scratch program.In the top left hand corner you should see a bunch of tabs (motion, looks, sound, etc.) Click on the "variables" tab, then click Add Variable. Name it "value 1" (actually, the name doesn't matter at all when using variables, so name them whatever you like). Add two more: "value 2" & "answer". Now, I'm not going to get complicated by making buttons and everything (so don't worry). Each variable should have shown up on the place with the cat (you can delete the cat if you want, just press the scissors button in the place with all the buttons on top.) Double click on value 1 and value 2 variables (NOT answer) until both of them have a slider underneath. You can also right-click (ctrl+click on a Mac) and set the slider min and max, which sets the limit the slider change the value of the variable to. Try dragging the slider... the number should increase and decrease. You can also drag the variable displayer around the screen to make it go to different spots (which you will HAVE to do to avoid cluttering parts of the screen).
I'd also reccomend editing the background so it's more interesting. press the blank white thing with "stage'' written under it in the part underneath the place displaying the variables, go to backgrounds and press "edit" and just draw something... you can arrange the variables after you're done to fit the background.

Now for the best part: coding.

Put this code into the background:
<when green flag clicked>
<forever>
   <if><key[ a ]pressed?>
     <set{ answer }to( (( <{ value 1 }> <+> <{ value 2 }> ))
   <end>
   <if><key[ s ]pressed?>
     <set{ answer }to( (( <{ value 1 }> <-> <{ value 2 }> ))
   <end>
   <if><key[ m ]pressed?>
     <set{ answer }to( (( <{ value 1 }> <*> <{ value 2 }> ))
   <end>
   <if><key[ d ]pressed?>
     <set{ answer }to( (( <{ value 1 }> </> <{ value 2 }> ))
   <end>
<end>
[/blocks]
And I'm pretty sure you'll have a working calculator.

HOW TO USE IT: Drag the value 1 and value 2 sliders to the numbers you want for the two math values. Then press A to add the numbers, S to subtract them, M to multiply them and D to divide them.

Or was that too detailed? It took over an hour to write...

Last edited by hmnwilson (2008-08-07 18:03:47)

c_unit wrote:

hmnwilson wrote:

I'll try to explain it from the very beginning, and without getting too technical... but this will just drag on.

First, open the scratch program.In the top left hand corner you should see a bunch of tabs (motion, looks, sound, etc.) Click on the "variables" tab, then click Add Variable. Name it "value 1" (actually, the name doesn't matter at all when using variables, so name them whatever you like). Add two more: "value 2" & "answer". Now, I'm not going to get complicated by making buttons and everything (so don't worry). Each variable should have shown up on the place with the cat (you can delete the cat if you want, just press the scissors button in the place with all the buttons on top.) Double click on value 1 and value 2 variables (NOT answer) until both of them have a slider underneath. You can also right-click (ctrl+click on a Mac) and set the slider min and max, which sets the limit the slider change the value of the variable to. Try dragging the slider... the number should increase and decrease. You can also drag the variable displayer around the screen to make it go to different spots (which you will HAVE to do to avoid cluttering parts of the screen).
I'd also reccomend editing the background so it's more interesting. press the blank white thing with "stage'' written under it in the part underneath the place displaying the variables, go to backgrounds and press "edit" and just draw something... you can arrange the variables after you're done to fit the background.

Now for the best part: coding.

Make a new sprite (it doesn't matter too much what you draw). Now put this code into the new sprite:
<when green flag clicked>
<forever>
<if><key[ a ]pressed?>
<set{ answer }to( (( <{ value 1 }> <+> <{ value 2 }> ))
<end>
<if><key[ s ]pressed?>
<set{ answer }to( (( <{ value 1 }> <-> <{ value 2 }> ))
<end>
<if><key[ m ]pressed?>
<set{ answer }to( (( <{ value 1 }> <*> <{ value 2 }> ))
<end>
<if><key[ d ]pressed?>
<set{ answer }to( (( <{ value 1 }> </> <{ value 2 }> ))
<end>
<end>
[/blocks]
And I'm pretty sure you'll have a working calculator.

HOW TO USE IT: Drag the value 1 and value 2 sliders to the numbers you want for the two math values. Then press A to add the numbers, S to subtract them, M to multiply them and D to divide them.

Or was that too detailed? It took over an hour to write...

Thankyou so much for the very depth reply, i really appreciate it.
When i get home i will have a look at it and see if i can get it working, i send my kindest regards to you sir. Thankyou. I will let you know if i have any problems.
Thankyou once again.

If you aren't worrying about looks, than that will work perfectly. Making buttons is way more complex. So if you are just after simplicity, go with that

I probably should have mentioned... if you put that script into the background, the same thing will happen. You can basically make a working calculator with no sprites whatsoever.
I'll edit the post to make it simpler.

Last edited by hmnwilson (2008-08-07 17:59:50)

This is probably over with, but hey, if you ever need to make a more advanced calculator, I just made one that uses arrays. It is very convenient and works when downloaded