[C Language][Stack] Using Link List to make Basic Stack working function

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

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

typedef struct s_node s_list;
typedef s_list *link;
link stack=NULL;

void print_stack( )
{
   link temp=NULL;
   temp=stack;

   if (temp==NULL)
       printf("The stack is empty!!\n");
   else
   {
        while (temp!=NULL)
        {
            printf("[%d] ",temp->data);
            temp=temp->next;
        }
        printf("\n");
   }
}

void push(int value)
{
    link newnode;
    newnode=(link) malloc (sizeof(s_list));
    newnode->data=value;
    newnode->next=stack;
    stack=newnode;
}

int pop( )
{
    link top;
    int temp;

    if (stack !=NULL)
    {
        top=stack;
        stack=stack->next;
        temp=top->data;
        free(top);
        return temp;
    }
    else
        return -1;
}

void main ( )
{
      link point;
      int select,value;
    do
    {
        printf("\n[1]Input a stack data");
        printf("\n[2]Output a stack data");
        printf("\n[3]Exit");
        printf("\nPlease select one=>");
        scanf("%d",&select);

        switch (select)
        {
         case 1:
             printf("\nPlease input the data=>");
             scanf("%d",&value);
             push(value);
             printf("[PUSH] The stack content current(top->bottom):");
             print_stack( );
             break;

         case 2:
             value=pop( );
             printf("The output value is [%d]",value);
             printf("\n");
             printf("The stack content current(top->bottom):");
             print_stack( );
             break;
        }
    } while (select !=3);
}