I've been trying to create an Adjancey List with an undirected graph. Everything is going smoothly, except for when I need to have a Node(or vertex as in my code) have multiple edges connected to it. I have 6 vertexs A,B,C,D,E,F and there's only edges from A to B, A to C, A to D this is what it looks like conceptually. I've been trying over and over to come up with an algorithm to connect more than one edge together, I can't figure it out. Here is my structures for reference, and where my else statement is where I need to walk through to the end of the linked edges and attach the new edge.
typedef struct
{
char c;
bool isVisited;
struct EDGETAG* p;
} VERTEX;
typedef struct EDGETAG
{
VERTEX* v;
struct EDGETAG* next;
} EDGE;
//~~~~~~~~
while( fgets(data,sizeof(data),filePtr) && elements < 50)
{
startPtr = data;
EDGE* e = (EDGE*)malloc(sizeof(EDGE));
//first character
int breakLogic = 0;
int i;
for( i = 0; i < 50; i++)
{
if(map[i].c == *startPtr)
{
elements = i;
break;
}
}
//first character
map[elements].c = *startPtr;
printf("%i %c\n",elements,map[elements].c);
//point first character to edge
if(map[elements].p == NULL)
{
map[elements].p = e;
}
else
{
/*Here is where I need help*/
}
startPtr += 2;
for( i = 0; i < 50; i++)
{
if(map[i].c == *startPtr)
{
elements = i;
breakLogic = 1;
break;
}
}
if( breakLogic == 0)
{
elements++;
}
//second character
map[elements].c = *startPtr;
printf("%i %c\n",elements,map[elements].c);
//point edge to second character
e -> v = &map[elements];
e -> next = NULL;
//loops at the newline
elements++;
}
}