Question

嘿伙计们，我有这个c程序工作，我想修改printbooking（），以便只打印状态为“签出”的房间到目前为止，我只是得到关于指针和整数之间的比较的错误....任何帮助我应该如何做到这一点？并且。我希望能够通过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“签出的房间”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]给出该索引处的字符，并将它与字符串进行比较，这就是问题所在。

我认为您需要使用Status与strcmp数组本身进行比较。

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

Answer 2

Status[15]是char，您正在尝试与const char *“签出”进行比较。我不知道“15”的用途是什么，但我怀疑你只想要

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

strcmp()是C中的字符串比较函数。

指针和整数错误之间的比较

2 个答案: