HOW CAN THIS ERROR BE FIXED?

Question

inlab21.cpp: In member function ‘DataType Queue::dequeue()’:

inlab21.cpp:28:2: error: ‘temp’ was not declared in this scope

temp=frontPtr

================================

// This is the default constructor.

Queue::Queue()

{

frontPtr = NULL;

rearPtr = NULL;

} // end default constructor

//qEmpty tests for an empty queue.

int Queue::qEmpty() const

{

return frontPtr == NULL;

} // end qEmpty

// This function takes the front element off of the queue. It assumes

// that the queue is not empty. Call 'qEmpty()' before calling this

// function to ensure that this is the case.

DataType Queue::dequeue()

{

temp=frontPtr

frontPtr=frontPtr->next

free(temp)

} // end enqueue

// This function adds an element to the rear of the queue.

void Queue::enqueue(const DataType& item)

{

NodePtr newPtr = new QueueNode;

newPtr->data = item;

newPtr->next = NULL;

if (qEmpty()) //Was the queue empty?

{

frontPtr = newPtr;

rearPtr = newPtr;

}

else

{

rearPtr->next = newPtr;

rearPtr = newPtr;

}

} // end enqueue

Answer 1

This can be fixed by simply declaring temp.