");
$this->stackPointer = 0;
$this->vector[0] = -1;
CS_ExitMethod("Stack");
}
function isEmpty()
{
CS_EnterMethod("isEmpty");
if ($this->stackPointer <= 0){
CS_ExitMethod("isEmpty");
return 1;
} else {
CS_ExitMethod("isEmpty");
return 0;
}
}
function push($element)
{
CS_EnterMethod("push");
++$this->stackPointer;
$this->vector[$this->stackPointer] = $element;
CS_ExitMethod("push");
}
function pop()
{
CS_EnterMethod("pop");
if ($this->isEmpty()){
CS_SendError("Stack empty
");
CS_ExitMethod("pop");
return -1;
} else {
$ret = $this->vector[$this->stackPointer];
--$this->stackPointer;
CS_SendVar( "stackPointer", $this->stackPointer );
CS_ExitMethod("pop");
return $ret;
}
}
function peek()
{
CS_EnterMethod("peek");
if ($this->isEmpty()){
CS_SendError("Stack empty
");
CS_ExitMethod("peek");
return -1;
} else {
CS_ExitMethod("peek");
return $this->vector[$this->stackPointer];
}
}
function reset()
{
CS_EnterMethod("reset");
$this->stackPointer = 0;
$this->vector[$this->stackPointer] = -1;
CS_DisplayInputData();
CS_ExitMethod("reset");
}
}
?>