指针和整数错误的比较

Question

大家好，我有这个 c 程序正在运行，我想修改 printbooking() 以便只打印状态为“已签出”的房间 到目前为止，我只收到关于指针和整数之间比较的错误......关于我应该如何做到这一点的任何帮助？ 并且。我希望能够使用 roomID 搜索房间并编辑他们的详细信息。任何帮助将不胜感激！ 这是我的代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct{
char BookId[7];
char CustId[7];
char RoomId[5];
char NumGuests[4];
char StartDate[11];
char EndDate[11];
char Status[20];
} booking_t;

int readBooking(booking_t *myStruct)
{
FILE *infile;
infile = fopen("booking.txt", "r");
char record[201];
char *token;
int i = 0;
while (fgets(record, 200, infile) != NULL) {
    token = strtok(record, ";");
    strcpy(myStruct[i].BookId, token);
    token = strtok(NULL, ";");
    strcpy(myStruct[i].CustId, token);
    token = strtok(NULL, ";");
    strcpy(myStruct[i].RoomId, token);
    token = strtok(NULL, ";");
    strcpy(myStruct[i].NumGuests, token);
    token = strtok(NULL, ";");
    strcpy(myStruct[i].StartDate, token);
    token = strtok(NULL, ";");
    strcpy(myStruct[i].EndDate, token);
    token = strtok(NULL, "\n");
    strcpy(myStruct[i].Status, token);
    i++;
}
fclose(infile);
return(i);
}

//这是我只想打印出“已签出房间”的代码

void printBooking(booking_t *myStruct, int Size)
{
    printf("Booking ID, Customer ID, Room ID, Number of Guests, Start Date, End Date, Status\n");
int i;
for(i = 0; i < Size;i++){
    if(myStruct[i].Status[15] == "checked-out") //the error message points to this line
printf("%s %s %s %s %s %s %s\n", myStruct[i].BookId, myStruct[i].CustId, myStruct[i].RoomId, myStruct[i].NumGuests, myStruct[i].StartDate, myStruct[i].EndDate, myStruct[i].Status); 
}
printf("\n");
}

//

void printMayBooking(booking_t *myStruct, int Size)
{
    printf("Booking ID, Customer ID, Room ID, Number of Guests, Start Date, End Date, Status\n");
int i;
for(i = 0; i < Size;i++){
    if(myStruct[i].StartDate[4] == '5')
        printf("%s %s %s %s %s %s %s\n", myStruct[i].BookId, myStruct[i].CustId, myStruct[i].RoomId, myStruct[i].NumGuests, myStruct[i].StartDate, myStruct[i].EndDate, myStruct[i].Status); 
}
printf("\n");       
}

int main()
{
    booking_t booking_list[50];
    int Size;
    Size = readBooking(booking_list);
    printBooking(booking_list, Size);
    printMayBooking(booking_list, Size);
    return(0);
}

Answer 1

if(myStruct[i].Status[15] == "checked-out")

myStruct[i].Status[15] 给出了该索引处的字符，您正在将其与问题所在的字符串进行比较。

我认为您需要使用strcmp 与Status 数组本身进行比较。

if( strcmp( myStruct[i].Status, "checked-out") == 0 )
// ...

Answer 2

Status[15] 是一个char，您正试图与const char *“签出”进行比较。我不知道“15”是什么意思，但我怀疑你只是想要

if(strcmp(myStruct[i].Status, "checked-out") == 0) 

strcmp()是C语言中的字符串比较函数。