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<pre align="left"><b><font face="Arial" size="4">
【<font color="#0033CC">example</font>】<font color="#FF0033">Add to a circular queue</font>
<br><font color="#FF0033"><i> *rear = (*rear + 1) %<font size="3"> MAX_AUEUE_SIZE</font></i></font>
void<font color="#FF0033"> addq</font>(int front, int *rear, element item)
{ <i><font size="3" color="#FF0099"> /* add an item to the queue */</font></i>
*rear = (*rear+1) %<font size="3"> MAX_QUEUE_SIZE</font>;
if ( front == *rear ) {
queue_full(rear); <font color="#FF0099"><i><font size="3">/* reset rear and print error */</font></i></font>
return;
}
queue[*rear] = item;
}
【<font color="#003399">example</font>】<font color="#FF0033">Delete from a circular queue</font>
<i><font color="#FF0033"> *front = (*front+1) %<font size="3"> MAX_QUEUE_SIZE</font>;</font></i>
element <font color="#FF0033">deleteq</font>(int *front, int rear)
{
element item;
<i><font size="3" color="#FF0099"> /* remove front element from the queue and put it in item */</font></i>
if ( *front == rear )
return queue_empty( ); <font color="#ff0099"><i><font size="3">/* queue_empty returns an error key */</font></i></font>
*front = (*front+1) % MAX_QUEUE_SIZE;
return queue[*front];
}
</font></b></pre>
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