Solved

Runtime Error: Warning about uninitialized variable

Posted on 2003-10-27
1
222 Views
Last Modified: 2010-07-27
Hi Experts,

I am trying to write the following code and have some trouble.  

#include <stdio.h>
typedef struct {
      int a;
      int b;
}Box;

void main()
{
    Box *myBox;
    myBox->a = 4;
}

I am getting this warning message when I compile: "local variable 'myBox' used without having been initialized "  and the program crashes when I run it.

How can I solve this problem?  How do I initialize this pointer??

Thanks
0
Comment
Question by:g_jey
1 Comment
 
LVL 4

Accepted Solution

by:
n_fortynine earned 50 total points
ID: 9631176
what you have there is a pointer. without having been initialized means that it is not given any memory, i.e. the instance of your struct Box has not been created. so you have to do:
Box* myBox;
myBox = new Box;
then you can use it all you want.
just remember to delete it after you're done with the instance
delete myBox;
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This tutorial is posted by Aaron Wojnowski, administrator at SDKExpert.net.  To view more iPhone tutorials, visit www.sdkexpert.net. This is a very simple tutorial on finding the user's current location easily. In this tutorial, you will learn ho…
Windows programmers of the C/C++ variety, how many of you realise that since Window 9x Microsoft has been lying to you about what constitutes Unicode (http://en.wikipedia.org/wiki/Unicode)? They will have you believe that Unicode requires you to use…
The goal of this video is to provide viewers with basic examples to understand and use pointers in the C programming language.
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use for-loops in the C programming language.

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question