Editing a List Program in C - c

Question

I am trying to edit a program I made a year ago, but it seems I am failing somewhere because I can't get the result I want. I want to make the program to sort the numbers from low to high and the user should enter numbers until 0 is pressed. Would love ot get some help from someone advanced!
#include <stdio.h>
#include <stdlib.h>
struct node
{
int data;
struct node *next;
};
struct node* List;
void Add(struct node* p, int d)
{
struct node* q;
q = malloc(sizeof(struct node));
if (q == NULL)
printf("Not enaugh memory!");
else{
q->data = d;
if (List == NULL || List->data < d)
{
q->next = List;
List = q;
} else {
struct node *ptr = List;
while ((ptr->next != NULL) && (ptr->next->data>d)){
ptr = ptr->next;
}
q->next = ptr->next;
ptr->next = q;
}
}
}
int main()
{
int n, i, a;
printf("How many numbers are you going to enter? ");
scanf("%d", &n);
for (i = 1; i <= n; i++)
{
printf("\nEnter a number: ");
scanf("%d", &a);
Add(List, a);
}
printf("\nEntered and sorted numbers are: ");
struct node *ptr = List;
while (ptr != NULL)
{
printf("%d ", ptr->data);
ptr = ptr->next;
}
printf("\n\n");
system("PAUSE");
return 0;
}

Answer 1

Just change to line
if (List == NULL || List->data < d)
to
if (List == NULL || List->data > d)
And change the line
while ((ptr->next != NULL) && (ptr->next->data>d)){
to
while ((ptr->next != NULL) && (ptr->next->data<d)){
And you have not added 0 check.Please add that, rest is fine. For this modify the for loop with this one
//printf("How many numbers are you going to enter? ");
//scanf("%d", &n);
for (;;)
{
printf("\nEnter a number: ");
scanf("%d", &a);
if(a == 0)
break;
Add(List, a);
}