Question

error C2440: '=' : cannot convert from 'struct BiNode *' to 'int'

void BiTree::LeverOrder()
{
int Q[200];
front=rear=-1;
if(root==NULL)return;
Q[++rear]=root;
while(front!=rear)
{
q=Q[++front];
cout<<q->data;
if(q->lchild!=NULL)Q[++rear]=q->lchild;
if(q->rchild!=NULL)Q[++rear]=q->rchild;
}
}

error C2440: '=' : cannot convert from 'struct BiNode *' to 'int'
This conversion requires a reinterpret_cast, a C-style cast or function-style cast
error C2227: left of '->data' must point to class/struct/union
error C2227: left of '->lchild' must point to class/struct/union
error C2227: left of '->lchild' must point to class/struct/union
error C2227: left of '->rchild' must point to class/struct/union
error C2227: left of '->rchild' must point to class/struct/union

Answer 1

类型转换错误，企图将struct BiNode*类型的变量转换为int类型，这是不正确的
具体到代码应该是root是struct BiNode*类型，而你的Q数组是int 类型，不能相互直接赋值。

追问

可以帮我修改一下代码吗？

追答

将int Q[200]改为struct BiNode *Q[200]；