Use player's score as amount in /give
I have a objective called DIFF. When a player hits a button, I would like to give them items based on their DIFF count multiplied by two. For instance: if DIFF is 1 then give them 2 items, if DIFF is 2 then give them 4 items, etc.
My current command (without multiplication):
/give @p minecraft:emerald {"score":{"name":"@p","objective":"DIFF"}}
But it says "score" is not a valid number. How can I use the player's score to determine the number of items when using /give?
Best Answer
Yeah, commands don't work like that. They're highly structured, and don't allow you to replace expected integers with expressions. You're going to have to do this the hard way. You'll also want to be using 1.9 for command block simplicity, although this solution will also work in 1.8 with well structured 20Hz clocks.
First, we need to set up another scoreboard objective that represents the number of items to give; let's call it NumItems:
/scoreboard objectives add NumItems dummy
We also need an intermediate scoreboard objective to avoid race conditions in the latter stages. This objective is what is going to multiply the DIFF score, so we'll call it Multiplier:
/scoreboard objectives add Multiplier dummy
Now, when a player hits the button, they need their NumItems score set to two times their DIFF score. We do that with the following commands:
/scoreboard players set @p Multiplier 2
/scoreboard players operation @p Multiplier *= @p DIFF
/scoreboard players operation @p NumItems = @p Multiplier
Great, now we have a number of items to give, we just need to give them... one at a time. Well, we can be a little more efficient than that, but we can't just give an arbitrary number of items. We'll break it down into giving 1 item, 10 items, and a stack of 64 items. Create a chain of command blocks off a repeating command block (or use a 20Hz clock) for these commands, edited to meet your needed specifics:
/give @a[score_NumItems_min=64] <item> 64 [...]
/scoreboard players remove @a[score_NumItems_min=64] NumItems 64
/give @a[score_NumItems_min=10] <item> 10 [...]
/scoreboard players remove @a[score_NumItems_min=10] NumItems 10
/give @a[score_NumItems_min=1] <item> 1 [...]
/scoreboard players remove @a[score_NumItems_min=1] NumItems 1
This is only one possible distribution of give values, and can easily be improved by choosing a geometric sequence like 2n (1, 2, 4, 8...), which should complete all give operations for item counts up to 128 in 1 or 2 ticks.
It should be apparent why we need the Multiplier objective, but in case it's not, it's so that we don't start giving items before DIFF has been doubled. As such, we should only write to the NumItems once when the button is pressed. Even though the likelihood of encountering a race condition error is low without using the Multiplier objective, it's best to avoid the problem entirely.
Pictures about "Use player's score as amount in /give"
How do you use the score command?
The syntax for the scoreboard would be "/scoreboard objectives add Money dummy" without parenthesis. To place this scoreboard to the sidebar, Minecraft players can then use the command "/scoreboard objectives setdisplay sidebar Money" which should display the scoreboard to the right of the screen.How do you use scoreboards in Minecraft?
Score is determined solely by the amount of experience you've collected since your last death. It is not how much experience you have when you die - experience you've spent still counts. For example, if you collect 50 experience, then spend 25 of it, your score is 50, not 25.How is Minecraft score calculated?
Scoreboard CommandWhen you use an opener against a blitz player
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