c++ - 文件.cpp :148: error: expected primary-expression before ‘.’ token DIFFERENT SYMBOL

Question

我正在努力完成这段代码。

#include (sorry but it won't show up the #include such as stdio.h AND OTHERS) But this is not the problem.


using namespace std;


struct CustomerFile {
    int arrivalTime;

    string driverfName,
        driverlName,
        typeOfDriver,
        driverLicNumber,
        vehicleMake,
        vehicleModel,
        Lot_taken,
        vehicleRegNumber,
        attendantName,
        ParkingArea,
        Comments,
        checkOutDateTime,
        checkInDateTime;
};

int arrivalTime;

string driverfName,

    driverlName,
    typeOfDriver,
    driverLicNumber,
    vehicleMake,
    vehicleModel,
    Lot_taken,
    vehicleRegNumber,
    attendantName,
    ParkingArea,
    Comments,
    checkOutDateTime,
    checkInDateTime;

int main(int argc, char * * argv) {

    FILE * cfPtr;

    if ((cfPtr = fopen("CustomerFile.dat", "rb+")) == NULL) {
        printf("file could not be opened");
    } else {
        printf("\nFile is Written to");
        printf("\nFile is open");

        printf("\n\n\nEnter Vehicle Registration Number: ");
        scanf("%s", & CustomerFile.vehicleRegNumber);

        while (CustomerFile.vehicleRegNumber != 0) /*#IF THE USER does not enter 0 the loops should begin, but there is a problem here*/
        {

            printf("\nFirst Name: ");
            fscanf("%s", CustomerFile.driverfName); /*here is the problem, I think is had something to do with the struct name*/
            printf("\nLast Name:  ");
            printf("\nType of Driver:  ");
            printf("\nDriver's License Number:  ");
            printf("\nVehicle Make:  ");
            printf("\nVehicle Model:   ");
            printf("\nComments   ");
            printf("\nParking SpaceTaken ");

            printf("\n\nenter firstname, lastname");
            fscanf(stdin, "%s%s%s%s%s%s%s%s1f", CustomerFile.driverfName I think this has something to do with the statement * /
                                CustomerFile.driverlName   / * okay here * /
                                CustomerFile.typeOfDriver       / * okay here * /
                                CustomerFile.driverLicNumber         / * okay here * /
                                CustomerFile.vehicleMake      / * okay here * /
                                CustomerFile.vehicleModel       / * okay here * /
                                CustomerFile.Comments       / * okay here * /
                                &CustomerFile.Lot_taken);       / * okay here * /


                        fwrite( sizeof(struct CustomerFile ), 1, cfPtr);




                }
                        fclose( cfPtr);
                }


return 0;

}

好吧，问题是它一直报错；*

File.cpp:144: error: expected primary-expression before ‘.’ token

File.cpp:148: error: expected primary-expression before ‘.’ token

File.cpp:162: error: expected primary-expression before ‘.’ token

File.cpp:172: error: invalid conversion from ‘unsigned int’ to ‘const void*’

File.cpp:172: error: invalid conversion from ‘FILE*’ to ‘size_t’ /usr/include/stdio.h:708: error: too few arguments to function ‘size_t fwrite(const void*, size_t, size_t, FILE*)’ File.cpp:172: error: at this point in file

我相信或读到它与 C++ 编译器不适用于 c99 这一事实有关。如果是这样，那么您如何在 C++ 中使用结构？我知道你使用一个结构，例如 CustomerFile.driverlName，但是，编译器一直拒绝它。我也遇到了 while 循环的问题。我熟悉 c 和 c++，我们学过 c 和 c++，代码将用 c++ 编写，但教科书提供的 c 代码无法在 c++ 编译器中运行。

Answer 1

CustomerFile 是一个类，因此当您尝试访问它的数据成员时它不会工作，就好像它是一个实例。要创建实例，请执行以下操作:

CustomerFile file;

并将 Customer. 的所有实例替换为 file.，它应该可以解决错误。