这个程序，编译器编译时候没有报错，运行时候为啥报错了。解决方案

这个程序，编译器编译时候没有报错，运行时候为啥报错了。。。

C/C++ code

#include<stdio.h>#include<malloc.h>struct list{ char data; list *lchild, *rchild;};list * creat(list * Q[]){ int ch; int front, rear; front = 1; rear = 0; list * root, * s; printf("输入第一个字符\n"); ch = getchar(); while(ch != '#') {  s = NULL;  if(ch != '@')  {    s = (list *) malloc(sizeof(list *));    s->data = ch;    s->lchild = NULL;    s->rchild = NULL;  }   rear ++;   Q[rear] = s;   if(rear == 1)       root = s;   else   {    if(s && Q[front])        if(rear % 2 == 0)            Q[front]->lchild = s;        else            Q[front]->rchild = s;        if(rear % 2 == 1)            front ++;   }   printf("继续输入\n");   ch = getchar(); }  return root;     }void main(){ list * Q[5]; creat(Q); printf("dd");}