Question

我正在努力寻找结果出了什么问题。它只打印出1条信息，而不是列表中的所有信息。我检查了从插入到显示的每个函数，但是与工作的示例没有什么不同。我现在真的很茫然。起初，我以为是我忘记了* alloc的* l，isEmptyTrain函数是错误的……但是修复所有这些之后，它仍然根本无法工作。你可以帮我做这个练习吗？下面是我的代码：

    typedef struct Car{
    char name;
    int number;
    struct Car *pNext;
} Car;

typedef struct Train{
    int size;
    Car *pHead;
} Train;
Car *initCar(char name, int number){ 
//  Car *car = (Car*)malloc(sizeof(*car));
    Car *p = new(Car);
    p->name = name;
    p->number = number;
    p->pNext = NULL;
    return p;
}
//initList
void initTrain(Train *l){
    l->size = 0;
    l->pHead = NULL;
}
bool isTrainEmpty(Train *l){
    return (l->size == 0);
}
bool isCarEmpty(Car *p){
    return (p->number == 0);
}
bool length(Train *l){
    return l->size;
}

void insert(Car *pNew, Train *l, Car *pOld = NULL){
    //insert first
    if(isTrainEmpty(l)){
        l->pHead = pNew;
    }
    else{
        pNew->pNext = pOld->pNext;
        pOld->pNext = pNew;
    }
    l->size++;
}
void display(Train *l){
    Car *p = l->pHead;
    for(int i = 0; i < length(l); i++){
        cout << "Car " << p->name << " has " << p->number << " passenger(s)" << endl;
        p = p->pNext;
    }
}
    int main(){
    Train *l, obj;
    l = new(Train);
    l = &obj;
    char name;
    int number = 0, size, add = 0, del = 0;
    Car *p, *q = NULL;

    initTrain(l);
    cout << "Enter the length of the train: " << endl;
    cin >> size;
    if(size <= 0) {
        cout << "The length must be greater than 0!" << endl;
        return 0;
    }
    else
        for(int i = 0; i < size; i++){
            cout << "Enter the name of the car (1 char): " << endl;
            cin >> name;
            cout << "Enter the number of passengers on the car: " << endl;
            cin >> number;
            p = initCar(name, number);
            if(i == 0){
                insert(p, l);
            }
            else{
                insert(p, l, q);
            }
            q = p; 
        }   
        display(l); return 0;}

谢谢！

Answer 1

length(l)返回一个bool。然后将其用作整数，从而将其转换为0或1；它永远无法返回大于1的值。

我的链接列表没有按预期打印？

1 个答案: