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<b><font face="Arial" size="4">
<font color="#FF0033">ABSTRACT DATA TYPE</font>
________________________________________________________________
Structure<font color="#FF3366"> Stack</font> is
<font color="#0033CC">object:</font> a finite ordered list with zero or more elements.
<font color="#0033CC">functions</font>:
for all stack <img src="../TEXT2/image/Image4.gif" width="13" height="13"> Stack, item <img src="../TEXT2/image/Image4.gif" width="13" height="13"> element,
max_stack_size <img src="../TEXT2/image/Image4.gif" width="13" height="13"> positive integer
<font color="#FF0099">Stack CreateS(max_stack_size)</font> ::=
create an empty stack whose maximum
size is max_stack_size
<font color="#FF0099">Boolean IsFull(stack, max_stack_size)</font> ::=
if ( number of elements in stack == max_stack_size )
return TRUE
else return FALSE
<font color="#FF0099">Stack Add(stack, item) </font>::=
if ( IsFull(stack) ) stack_full
else insert item into top of stack and return
<font color="#FF0099">Boolean IsEmpty(stack)</font> ::=
if ( stack == CreateS(max_stack_size) )
return TRUE
else return FALSE
<font color="#FF0099">Element Delete(stack)</font> ::=
if ( IsEmpty(stack) ) return
else remove and return the item on the top of the stack
_________________________________________________________
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