linked list stack

[skarosi]

Hi all,
I am trying to solve a problem found on a book slides(Problem solving with C++,Walter Savitch) and i got some problems.

I am supposed to do my own the push function for the stack, so i create a new ptr,
void Stack:ush(char the_symbol)
{StackFramePtr temp_ptr = new StackFrame;
temp_ptr->data=the_symbol;
and then i try to point the link from the head to the new node
top->link=temp_ptr;
and i get this error
Segmentation fault (core dumped)
Apart that I dont know what this error means, even though i search for it on the net, i dont see why this command top->link=temp_ptr; would cause that!

Top is declared on the header file as
StackFramePtr top;

There is this function
Stack::Stack():top(NULL)
{
//Body intentionally empty
}
would i have to initialize the top pointer here? The problem is that this function is not called by anyone else on the main program that was predone for me.

I guess i could initialise it if the stack is empty and never again.

Thanks in advance
Ilias

 

[skarosi]

No worries everybody,
I figured it out. Well actually i didnt, i just typed everything again and it worked! most likely some typo somewhere!

 

[ArkM]

May be it was not a misprint? Have you any logic before

top->link - temp_ptr;

in Stack:ush? You have top == 0 when the 1st char pushed into the empty stack, so segmentation fault etc...

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