#include<stdio.h>
#include<stdlib.h>
typedef int datatype;
#define maxsize  1024
typedef struct node
{
    datatype tata;
    struct node *next;
}link;
void insert(link *L,datatype x)
{
    link *s=NULL,*r=NULL;
    s=malloc(sizeof(link));
}
1.cpp(13) : error C2440: '=' : cannot convert from 'void *' to 'struct node *'
        Conversion from 'void*' to pointer to non-'void' requires an explicit cast

  s=malloc(sizeof(link));
请进行强制类型转换：
s = (link *)malloc(sizeof(link));

#include<stdio.h>
#include<stdlib.h>
typedef int datatype;
#define maxsize  1024
typedef struct node
{
    datatype tata;
    struct node *next;
}link;
void insert(struct node *L,datatype x)
{
    struct node *s=NULL,*r=NULL;
    s=(struct node*)malloc(sizeof(link));
}