Question

我正在为一个大学项目编写此代码，我需要将此文本文件加载到单链接列表中。但是在打印时，它仅打印文件的第一行（LinkedList中的第一个节点）。 .txt文件中的行如下：

大众高尔夫2017白色120000

大众高尔夫2017黑色121000

大众POLO 2018橙色95000

大众CADDY 2015黑色145000

大众CADDY 2015黑色145000等。

任何帮助将不胜感激，谢谢！查看代码：

struct sCar{
char manufacturer[15];
char model[15];
int year;
char colour[10];
float price;
struct sCar *nextInLine;
};
//Changing name for convenience.
typedef struct sCar * LIST;
typedef struct sCar * NODE;

int main()
{
    printf("\n\n** START **\n\n");
    LIST carsList;
    carsList = MakeEmpty(NULL); //Initialized. (carsList) is now the Head.   

    NODE temp;
    temp = (NODE)malloc(sizeof(struct sCar));
    FILE *fPtr;
    if ((fPtr = fopen("cars.dat", "r")) == NULL)
        puts("File could not be opened");
    else
    {
        fscanf(fPtr, "%s %s %d %s %f", &temp->manufacturer, &temp->model,     
               &temp->year, &temp->colour, &temp->price);
        if(carsList->nextInLine == NULL)
        {
            carsList->nextInLine = temp;
            temp->nextInLine = NULL;
        }
        else
        while(fscanf(fPtr, "%s %s %d %s %f", &temp->manufacturer, &temp->model, &temp->year, &temp->colour, &temp->price) == 5)
        {
        NODE newNode;
            newNode = (NODE)malloc(sizeof(struct sCar));
            fscanf(fPtr, "%s %s %d %s %f", &newNode->manufacturer, &newNode->model, &newNode->year, &newNode->colour, &newNode->price);
            temp->nextInLine = newNode;
            temp = newNode;
            temp->nextInLine = NULL;
        }
    }
    printNodes(carsList);
    return 0;
}

LIST MakeEmpty(LIST L)
{
    if(L != NULL)
        DeleteList(L);
    L = NULL;
    L = (LIST)malloc(sizeof(struct sCar));
    if(L==NULL)
        printf("Out of Memory. Can't Allocate List.");
    else
        L->nextInLine = NULL;
    return L;
}


void printNodes(LIST L)
{
    LIST temp;
    temp = L->nextInLine;
    while(temp != NULL)
    {
        printf("\n\nManufacturer: %s", temp->manufacturer);
        printf("\nModel: %s", temp->model);
        printf("\nYear: %d", temp->year);
        printf("\nColour: %s", temp->colour);
        printf("\nPrice: %.2f\n", temp->price);
        temp = temp->nextInLine;

    }
}

Answer 1

    struct sCar {
       char manufacturer[15];
       char model[15];
       int year;
       char colour[10];
       float price;
       struct sCar *nextInLine;
    };

    typedef struct sCar * LIST;
    typedef struct sCar * NODE;

   void printNodes(LIST L)
   {
       while(L != NULL) {
           printf("\n\nManufacturer: %s", L->manufacturer);
           printf("\nModel: %s",     L->model);
           printf("\nYear: %d",      L->year);
           printf("\nColour: %s",    L->colour);
           printf("\nPrice: %.2f\n", L->price);
           L = L->nextInLine;
       }
    }

    int main()
    {
        printf("\n\n** START **\n\n");
        LIST carsList;
        carsList = malloc(sizeof(struct sCar));

        FILE *fPtr;
        if((fPtr = fopen("cars.dat", "r")) == NULL)
            puts("File could not be opened");
        else
        {
            NODE NEXT = carsList;
            while(NEXT != NULL && fscanf(fPtr, "%s %s %i %s %f", &(*NEXT->manufacturer), &(*NEXT->model), &(*NEXT).year, (*NEXT).colour, &(*NEXT).price) != EOF) {
                NODE newNode;
                newNode = (NODE)malloc(sizeof(struct sCar));
                NEXT->nextInLine      = newNode;
                NEXT                  = newNode;
            } 
            printNodes(carsList);
        }
    }

我将它留给您，以了解您如何停止循环。控制台上打印的最后一项是没有设置任何字段的空sCar。

将txt文件读入链接列表，但“仅打印”将打印列表中的第一个节点

1 个答案: