scanf 和getchar被忽略了在c语言

我加了这个还是不行_CRT_SECURE_NO_WARNINGS

#include
#include"ColossusAirlines.h"
#define _CRT_SECURE_NO_WARNINGS

int main(void)
{
    while (1)
    {
        getchar();
        InitSeatTable();
        PrintMenu();
        char option = getchar();
        switch (option)
        {

        case 'a':
            EmptySeat();
            break;
        case 'b':
            PrintSeatList();
            break;
        case 'c':
            SeatList();
            break;
        case 'd':
            printf("please choose a seat\n");
            char seatID[IDleng];
            scanf("%s", seatID);
            printf("please enter your first name:\n");
            char FirsName[FirNameLeng];
            scanf("%s", FirsName);
            printf("please enter your last name:\n");
            char LastName[LasNameLeng];
            scanf("%s", LastName);
            int ret = AssignSeat(seatID, FirsName, LastName);
            if (ret == 1)
            {
                printf("Assigned success\n");
            }
            else if (ret == -2)
            {
                printf("Assigned failed seat id no exist\n");
            }
            else if (ret == -1)
            {
                printf("this seat have assigned! please choose another seat\n");
            }
            break;
        case 'e':

            break;
        case 'f':

            break;
        default:
            printf("wrong command.\n");
        }
        return 0;
    }
}

把scanf换成scanf_其实你不用管他没啥影响的