linkedlist c program

[shariefbe]

Here is my linked list c program i dont know what is the error in this program before posting the error could anyone please tell me what is the error in this?

#include<stdio.h>
#include<stdlib>
struct node
{
  int data;
  struct node *ptr;
}
int a,i=0;
  struct node *tmp,*lob,*pnt;
  tmp=(struct node *)malloc(sizeof(struct node));
  lob=(struct node *)malloc(sizeof(struct node));
  pnt=(struct node *)malloc(sizeof(struct node));
main()
{
   int o;
 while(1)
{
 printf("Whether you want to add data\n" 
        "1.yes\n"
        "2.print\n"
        "3.exit                :");
scanf("%d",&o);
switch(o)
{
case(1):
{   
add();
break;
}
case(2):
{   
print();
break; 
}
case(3)
exit(1);
}
}
}
add()
  {
scanf("%d",&a);
lob->data=a;
lob->ptr=NULL;
tmp->ptr=lob;
tmp=lob;
if(i<1)
{
pnt=tmp;
i++;
}
}
print()
  {
while(pnt->data==NULL)
{
printf("%d\n",pnt->data);
pnt=pnt->ptr;
}
}

I am doing my program in GCC. Not in turbo c

[gerard4143]

Where to start...This should be called within the main function.

tmp=(struct node *)malloc(sizeof(struct node));
lob=(struct node *)malloc(sizeof(struct node));
pnt=(struct node *)malloc(sizeof(struct node));

[shariefbe]

now i am getting these errors

linkedlist.c:7: error: two or more data types in declaration specifiers
linkedlist.c:7: error: invalid initializer
linkedlist.c: In function ‘main’:
linkedlist.c:12: warning: incompatible implicit declaration of built-in function ‘malloc’
linkedlist.c:36: error: expected ‘:’ or ‘...’ before ‘exit’
linkedlist.c:36: warning: incompatible implicit declaration of built-in function ‘exit’
linkedlist.c: In function ‘add’:
linkedlist.c:42: warning: format ‘%d’ expects type ‘int *’, but argument 2 has type ‘struct node *’
linkedlist.c:43: error: ‘lob’ undeclared (first use in this function)
linkedlist.c:43: error: (Each undeclared identifier is reported only once
linkedlist.c:43: error: for each function it appears in.)
linkedlist.c:45: error: ‘tmp’ undeclared (first use in this function)
linkedlist.c:47: error: invalid operands to binary < (have ‘struct node’ and ‘int’)
linkedlist.c:49: error: ‘pnt’ undeclared (first use in this function)
linkedlist.c:50: error: wrong type argument to increment
linkedlist.c: In function ‘print’:
linkedlist.c:55: error: ‘pnt’ undeclared (first use in this function)

could anyone please help me what is the error

[gerard4143]

#include<stdlib>

should be

#include<stdlib.h>

That should correct some of the errors.

[shariefbe]

still i am getting these errors

linkedlist.c:8: error: two or more data types in declaration specifiers
linkedlist.c:8: error: invalid initializer
linkedlist.c: In function ‘main’:
linkedlist.c:37: error: expected ‘:’ or ‘...’ before ‘exit’
linkedlist.c: In function ‘add’:
linkedlist.c:43: warning: format ‘%d’ expects type ‘int *’, but argument 2 has type ‘struct node *’
linkedlist.c:44: error: ‘lob’ undeclared (first use in this function)
linkedlist.c:44: error: (Each undeclared identifier is reported only once
linkedlist.c:44: error: for each function it appears in.)
linkedlist.c:46: error: ‘tmp’ undeclared (first use in this function)
linkedlist.c:48: error: invalid operands to binary < (have ‘struct node’ and ‘int’)
linkedlist.c:50: error: ‘pnt’ undeclared (first use in this function)
linkedlist.c:51: error: wrong type argument to increment
linkedlist.c: In function ‘print’:
linkedlist.c:56: error: ‘pnt’ undeclared (first use in this function)

[gerard4143]

Your functions add() and print() should be declared above the main function....not inside of it plus your printf function should only have one string like below:

printf("Whether you want to add data\n1.yes\n2.print\n3.exit:");

In your switch statement your mixing up colons and semi-colons.

[AdnanShaheen]

As "gerard4143" mentioned, your printf() is wrong, causing problems.
So as your struct is not ending with a semi-colon. That is also creating problems for the datatype "node" used.

Fix them, and then post if any further errors.

[Rubberman]

Is this a class exercise, or are you trying to teach yourself C programming? The errors in this example are myriad and serious, but elementary and violate the most basic C programming principals and current C language standards. None of the errors are difficult to fix, but I won't help until I know for sure that this is not school work.