Access Violation

Hi there, I am very new to programming and I am currently going through some material provided by my course lecturer. I am trying to learn about data structures with the code below. It compiles fine but when I try to run it, I get an Access Violation message. I'm using CC386 IDE. Any ideas as to why I am getting this message? Any help will be greatly appreciated.

Code:

#include <string.h>

typedef struct{  
	unsigned char Type[20];
	unsigned int Next, Previous;

}Shape;

Shape MyShape[3];

void main(){

	strcpy(MyShape[0].Type ,"Square");				//Define a Square Shape
	MyShape[0].Next=1;
	MyShape[0].Previous=2;
	
	strcpy(MyShape[1].Type ,"Triangle");			//Define a Triangle Shape
	MyShape[1].Next=2;
	MyShape[1].Previous=0;
	
	strcpy(MyShape[2].Type ,"Circle");				//Define a Circle Shape
	MyShape[2].Next=0;
	MyShape[2].Previous=1;
	
	int n,p,c;
	while(1){										//Loop forever
				p=MyShape[c].Previous;				//Read current Shape's previous neighbour
				n=MyShape[c].Next;					//Read current Shape's next neighbour
													//Print current, previous and next shape
				printf("\n\n%sis followed by %s and preceded by %s",MyShape[n].Type, MyShape[p].Type, MyShape[c].Type);
													
				c++;if(c>2) c=0;					//Reset counter at 3
				for(long d=0;d<5e8;d++);			//Delay output
			}
}

'c' is not initialized to anything before you use it as an index in the while(1) loop.

When in doubt, comment out code until you find the line(s) that blow it up.

Plus...

Code:

	MyShape[2].Previous=1;
	
	int n,p,c;
	while(1){										//Loop forever
.
.
.
        for(long d=0;d<5e8;d++);

While it may be valid to declare variables all over the place, IMO it's cleaner and easier to detect errors if they are all declared at the top.

Thank you for your response.
Sorry for the incredibly late reply, I've been on holiday

It turns out that the software didn't like my laptop for some reason! I just did my project at uni in the end.
Thanks again, much appreciated