SQD

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SQD (Stack, Queue and Deque) is an esolang by User:ChuckEsoteric08.

Specification

SQD uses Stack, Queue and Dequeue as memory.

Commands for Stack:

number from 0 to 9 followed by 0 - push number from 0 to 9 to the stack.
+, -, * or / followed by 0 - pop a and b and push b<op>a.
?0 - pop and declare label with popped element as its name.
=0[...] - pop a and b and if they are equal execute code inside the brackets.
>0[...] - pop a and b and if they b>a equal execute code inside the brackets.
<0[...] - pop a and b and if they b>a equal execute code inside the brackets.
"0 - pop element and goto label which names is equal to popped value.
:0 - duplicate top element.
;0 - pop a and b then push b a times.

Commands for Queue:

number from 0 to 9 followed by 1 - enqueue number from 0 to 9.
+, -, * or / followed by 1 - dequeue a and b and enqueue a<op>b.
?1 - dequeue and declare label with dequeued element as its name.
=1[...] - dequeue a and b and if they are equal execute code inside the brackets.
>1[...] - dequeue a and b and if they a>b equal execute code inside the brackets.
<1[...] - dequeue a and b and if they a>b equal execute code inside the brackets.
"1 - dequeue element and goto label which names is equal to dequeued value.
:1 - duplicate bottom element.
;1 - dequeue a and b then enqueue a b times.

Commands for Dequeue:

number from 0 to 9 followed by 20 - push digit x to the top
+, -, * or / followed by 20 - pop a and b from top and push b<op>a to top
?20 - pop and declare label with popped element as its name
=20[...] - pop a and b from top and if they are equal execute code inside the brackets
>20[...] - pop a and b from top and if they b>a equal execute code inside the brackets
<20[...] - pop a and b from top and if they b>a equal execute code inside the brackets
"20 - pop element and goto label which names is equal to popped value
:20 - duplicate top element
;20 - pop a and b then push b a times
number from 0 to 9 followed by 21 - enqueue x
+, -, * or / followed by 21 - pop a and b from bottom and push a<op>b to the bottom
?21 - dequeue and declare label with dequeued element as its name
=21[...] - pop a and b from bottom and if they are equal execute code inside the brackets
>21[...] - pop a and b from bottom and if they a>b equal execute code inside the brackets
<21[...] - pop a and b from bottom and if they a>b equal execute code inside the brackets
"21 - dequeue element and goto label which names is equal to dequeued value
:21 - duplicate bottom element
;21 - dequeue a and b then enqueue a b times
& - pop element from bottom and push it to top
$ - pop element from top and push it to bottom