Thread: Why am I getting this error?

Flex,

Remove the line: struct node; and try again. Structures do not use prototypes.

I've taken a longer look at it. Creating a new variable of type 'node' requires the struct keyword.

Code:

node *head=NULL, *tail=NULL; /* Incorrect */

struct node *head=NULL, *tail=NULL; /* Correct */

Also, the keyword new is C++, not C. Try using malloc() or posting in the C++ forum.

Here, this compiles without error (I leave it up to you to discover any run-time anomalies):

Code:

#include <stdio.h>

struct node
{
  char value;
  struct node *next;
};

struct node *head=NULL, *tail=NULL;

void addNode(char);
void printList();

int main( void )
{
  char input;

  printf("Enter you name:\n");
  input = getchar();
  while( input != '\n' )
  {
    addNode( input );
    input = getchar();
  }

  printf("\nYou have entered: ");
  printList();

  printf("\n\nProgram complete\n");
}

void addNode( char val )
{
  struct node *insert;

  insert = (struct node *) malloc( sizeof(struct node) );
  insert->value = val;
  insert->next = NULL;

  if( head == NULL ) //if the list is empty
    head = tail = insert;
  else
  {
    tail->next = insert;
    tail = insert;
  }
}

void printList()
{
  struct node *p = head;

  while( p != NULL )
  {
    printf("%c", p->value );
    p = p->next;
  }
}