[C] deleting node from graph Post: 302531699

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Top Forums Programming [C] deleting node from graph Post 302531699 by Luke Bonham on Friday 17th of June 2011 01:52:23 PM

06-17-2011

Registered User

[C] deleting node from graph

Using adjacency lists, I implemented this operation as follows:

Code:

/* remove the first node it finds with value 'val' in L list */
edge *removeEdge (edge *L, int val)
{
      if( !L ) return NULL;

      if( L->key == val )
      {
          edge *temp = L->next;
          free (L);
          return temp;
      }

      L->next = removeEdge (L->next, val);

      return L;
}

/* deletes node with key u from G */
int g_deleteNode (graph *G, int u)
{
    int i;     
    
    if( G != NULL && (u >= 0 && u < G->nv) )
    {   
        for( i = 0; i < G->nv; i++ )
             /* because removeEdge is a list node removing function */
             G->adj[i]->next = removeEdge (G->adj[i]->next, u);
        
        for( i = u; i < G->nv; i++ )
             if( i + 1 < G->nv ) G->adj[i] = G->adj[i+1];
        
        free(G->adj[i]);
        
        G->nv--;
               
        return 1;
    }
    
    else
    {
        if( !G ) printf("Error: null graph.\n");
        else printf("Error: edge does not belong to graph.\n");        
        return 0;
    }
}

Fact is, sometimes it crashes: could you help me understand why?

And is this a good implementation, or could I do better?

Thanks in advance.

Luke Bonham

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LEARN ABOUT DEBIAN

blt_treenodeid

Blt_TreeNodeId(3)					      BLT Library Procedures						 Blt_TreeNodeId(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Blt_TreeNodeId - Returns the node serial number.

SYNOPSIS

       #include <bltTree.h>

       unsigned int
       Blt_TreeNodeId(node)

ARGUMENTS

       Blt_TreeNode   node   (in)      Node whose ID is to be returned.
_________________________________________________________________

DESCRIPTION

       This  procedure	returns the node serial number.  The node serial number is useful for programs that export the tree data object to the Tcl
       programming level.  Since node labels (and therefore pathnames) are not unique, the ID can be used to uniquely identify a node.

       The arguments are as follows:

       node	 The node whose serial number is returned.  The serial number of the root node for example is always 0.

RETURNS

       The serial number of the node.  Nodes are given a unique serial number when they are created.  You can use the ID  to  later  retrieve  the
       node using Blt_TreeGetNode.

EXAMPLE

       The following example prints the ID of a node.

	      printf("root ID is %s
", Blt_TreeNodeId(node));

KEYWORDS

       Tcl_TreeCreateNode, Tcl_TreeDeleteNode

BLT
									2.4							 Blt_TreeNodeId(3)

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