Thread: Linked List Program Error

Hello,
I am writing a simple linked list implementation program... But im facing a problem in printing the contents of list, here is the code..

Code:

#include<stdio.h> 
 
void insert(int value); 
int delete(); 
void showList(); 
 
struct node 
{ 
   int data; 
   struct node *nextNode; 
}; 

//start pointer node 
struct node *start = NULL; 
 
int main() 
{ 
 
   int c=0,value; 
   printf("\nThis Program demonstrates simple Linked List\n"); 
   while(c != 4) 
   { 
      printf("Choices:\n"); 
      printf("Press 1 to insert into Linked List\n"); 
      printf("Press 2 to delete from Linked List\n"); 
      printf("Press 3 to display Linked List\n"); 
      printf("Press  to quit\n"); 
      scanf("%d",&c); 
 
      switch(c) 
      { 
         case 1: 
            printf("\n Enter Value that you want to insert:\n"); 
            scanf("%d",&value); 
            insert(value); 
            break; 
         case 2: 
            printf("\n Deleting first element from List:\n"); 
            printf("\n%d \n", delete()); 
            break; 
         case 3: 
            printf("\n Linked List:\n"); 
                break; 
 
        case 4: 
            printf("\nQuitting.....\n");
            exit(0); 
 
         default: 
            printf("\nNot a valid choice..\n"); 
 
      } 
   } 
 
   return 0; 
} 
 
void insert(int value) 
{ 
     
   struct node *n; 
    n = (struct node *)malloc(sizeof(struct node)); 
   n->data = value; 
    if(start == NULL) 
    { 
        printf("start null\n"); 
        start = n; 
        n->nextNode = NULL; 
     
    } 
    else 
    { 
        n->nextNode = start; 
        start = n; 
    } 
} 
 
int delete() 
{ 
    return 0;     
} 

//this portion is creating problem...  
void showList() 
{ 
    struct node *t; 
    t = start; 
 
    while(t!= NULL) 
    { 
        printf("%d , ",t->data); 
        t = t->nextNode; 
    } 
}

Whenever i choose 3, that is list the contents of list.. it shows blank..
I don't understand where is the fault..

Originally Posted by Salem

Well the first problem is, you're not even calling showList() anywhere in main.

When you're done inside your loop, calling printf("\n"); would be good as well, to ensure you see output.

LOL... i forgot tht sorry....
Now it's working.. Thnx!!