下面程序中分配内存空间函数malloc的使用为什么会报错?
#include <stdio.h>
main()
{
    struct stu
    {
      int num;
      char *name;
      char sex;
      float score;
    }  *ps;
    ps=(struct stu*)malloc(sizeof(struct stu));
    ps->num=102;
    ps->name="Zhang ping";
    ps->sex='M';
    ps->score=62.5;
    printf("Number=%d\nName=%s\n",ps->num,ps->name);
    printf("Sex=%c\nScore=%f\n",ps->sex,ps->score);
    free(ps);
}