#include <stdio.h>
int main(void)
{
        typedef struct test_t{
        int id;
        char name[30];
        char address[100];
        }test;
    test *a;
    a->id=100;
    a->name="sunxx";
    a->address="China";
    printf("\nYour Id is %d\nYour name is %s\nyour address is %s\n",a->id,a->name,a->address)
    return 0;
}

test *a;  没对结构体初始化。。。
printf("\nYour Id is %d\nYour name is %s\nyour address is %s\n",a->id,a->name,a->address)
未加分号。。。。

唉

问题在结构体的字符串数组里

    a->name="sunxx";
    a->address="China";
 用  strcpy  。。。。

2楼说的问题更严重