top of stack

greatunknown · 10-27-2009, 04:28 PM

This may seem simple, but how should I assign a variable "d" to the top of a stack for use in comparing a string variable to the variable at the top of the stack?

quzah · 10-27-2009, 04:34 PM

Keep a pointer to the the top of the stack. It depends on how you are implementing it. You'll need to be more specific. By 'top' do you mean the last thing you have pushed, or the first thing?

Quzah.

greatunknown · 10-27-2009, 04:45 PM

so i have an empty stack, i need "char d" to be assigned to the top of the stack, meaning the last thing pushed, in order to compare it with something else without having to pop the stack and then compare

how should char "d" be assigned?

quzah · 10-27-2009, 04:54 PM

You could write a peek function that returns the last item entered into the stack, without actually removing it. But if you're going to try to compare multiple items, or chains of items, I don't know that a stack is really what you want. Generally you just push whatever you want on the stack, and then you pop the top on and compare it.

Code:

type peek( stack *s )
{
    return s->top;
}

Quzah.

10-27-2009, 04:28 PM	#1
greatunknown Registered User Join Date: Sep 2009 Posts: 13	top of stack This may seem simple, but how should I assign a variable "d" to the top of a stack for use in comparing a string variable to the variable at the top of the stack?
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10-27-2009, 04:34 PM	#2
quzah +++ OK NO CARRIER Join Date: Oct 2001 Posts: 10,642	Keep a pointer to the the top of the stack. It depends on how you are implementing it. You'll need to be more specific. By 'top' do you mean the last thing you have pushed, or the first thing? Quzah. __________________ Hundreds of thousands of dipshits can't be wrong. Are you up for the suck?
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10-27-2009, 04:45 PM	#3
greatunknown Registered User Join Date: Sep 2009 Posts: 13	so i have an empty stack, i need "char d" to be assigned to the top of the stack, meaning the last thing pushed, in order to compare it with something else without having to pop the stack and then compare how should char "d" be assigned?
greatunknown is offline

10-27-2009, 04:54 PM	#4
quzah +++ OK NO CARRIER Join Date: Oct 2001 Posts: 10,642	You could write a peek function that returns the last item entered into the stack, without actually removing it. But if you're going to try to compare multiple items, or chains of items, I don't know that a stack is really what you want. Generally you just push whatever you want on the stack, and then you pop the top on and compare it. Code: type peek( stack *s ) { return s->top; } Quzah. __________________ Hundreds of thousands of dipshits can't be wrong. Are you up for the suck?
quzah is offline

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