Data structures in C, Series 1.1: Linked Lists

Adding element to a linked list in C by making a function Push();
We will make the head of the list global for easy access to all the function .
#do comment if any doubt

#include<stdio.h>
#include<stdlib.h>

struct node
{
    int data;
    struct node * next;
};

struct node * s;

void push()
{   struct node * temp,*cur;
    temp = (struct  node *)malloc(sizeof(struct node));
    scanf("%d",&temp->data);
    temp->next=NULL;
    cur = s;
    if(s == NULL)
    {
        s= temp;
    }
   
    else
    {
        while(cur->next != NULL)
        {
            cur = cur->next;
        }
        cur->next = temp;
    }
    printf("done ");
}

void printm()
{   struct node * temp = s;
    while(temp!= NULL)
    {
    printf("%d>>",temp->data);
    temp = temp->next;
    }
    printf("DONE");
}

int main()
{
    s = (struct node *)malloc(sizeof(struct node));
    s = NULL;
    int h;

    while(1){
    printf("1 to push and 2 to print and 0 to exit");
    scanf("%d",&h);
    if(h ==1)
        push();
    if(h == 2)
        printm();
    if(h == 0)
        break;
    }
    return 0;
}