单向链表全部逆置，自以为我的代码没有错呀。

void reverse(head)
{
ex *p,*q;
p = head->next;
q = p->next;
head->next = NULL;
while (p->next!=NULL)
{

    p->next = head;
    head = p;      
    p = q;
    q = p->next;

}
head = p;
}

你这链表有没有头结点

有头结点的代码如上所示

 void reverse(head){
    ex *p,*q;
    p = head->next;
    while(p != NULL){
        q = p->next;
        p->next = head->next;
        head = p;
        p = q;
    }
}