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Note also that while pop/3 has three parameters, the function implementation looks like it has two. This is because the !Stack "parameter" is actually a ''pair'' of parameters using Mercury's state variable notation. !Stack is, in effect, two variables: !.Stack and !:Stack, input and output respectively. Using state variable notation here is a bit of overkill but again was brought in for pedagogical reasons to show the syntax.
=={{header|MIPS Assembly}}==
<lang MIPS>
addi sp,sp,-4
sw t0,0(sp) ;push
lw t0,0(sp)
addi sp,sp,4 ;pop
lw t0,0(sp) ;top</lang>
"Empty" requires you to know the starting value of <code>SP</code>. Since it's hardware-dependent, there's no one answer for this part of the task.
=={{header|MiniScript}}==
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