学习一段时间c后 用vs2015编写的小程序，代码如下：
//14-9.c
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "14-9.h"
int main()
{
int flight;
char choice;
struct plane seat[FLIGHTNUM][SEATS];
FILE *data;
Process mode[5] = { show_empty_number,show_empty_list,show_alphabetical_list,add_assign,del_assign };
if (fopen_s(&data, "SeatsData.dat", "r") == 0)
{
for (int f = 0; f < FLIGHTNUM; f++)
load_file(data, seat[f]);
fclose(data);
}
for (int f = 0; f < FLIGHTNUM; f++)
for (int n = 0; n < SEATS; n++)
{
seat[f][n].number = n + 1;
if (!seat[f][n].sold)
{
clean_name(&seat[f][n]);
}
}
flight = choose_flight();
if (flight != 4)
do {
do {
choice = menu();
if (!strchr("abcdefq", choice))
{
printf("Input error. Please try again.\n");
continue;
}
} while (!strchr("abcdefq", choice));
if(strchr("abcd",choice))
(mode[choice - 'a'])(seat[flight]);
switch (choice)
{
case 'f':
check_status(flight, seat[flight]);
break;
case 'q':
printf("\n");
flight = choose_flight();
break;
}
numsort(seat[flight]);
} while (flight != 4);
fopen_s(&data, "SeatsData.dat", "w");
for (int f = 0; f < FLIGHTNUM; f++)
{
fprintf(data, "=======%s======\n", flight_list[f]);
for (int n = 0; n < SEATS; n++)
{
fprintf(data, "%2d %s %s %s\n", n + 1, (seat[f][n].sold) ? "Sold " : "Empty", seat[f][n].fname, seat[f][n].lname);
free(seat[f][n].fname);
free(seat[f][n].lname);
}
}
fclose(data);
getchar();
return 0;
}
以下是包含的头文件14-9.h:
//14-9.h
#define SEATS 12
#define FLIGHTNUM 4
#define NMAX 15
#define DATAMAX 40
#define SOLDPOS 3
#define NAMEPOS 9
struct plane
{
int number;
bool sold = 0;
char *lname;
char *fname;
};
typedef void(*Process)(struct plane *);
char *flight_list[4] = { "Flight 102","Flight 311","Flight 444","Flight 519" };
void clean_name(struct plane *seat)
{
seat->fname = (char *)malloc(1);
seat->lname = (char *)malloc(1);
seat->fname[0] = '\0';
seat->lname[0] = '\0';
}
void load_file(FILE *data, struct plane *seat)
{
static int load_time = 0;
char dataline[DATAMAX];
fgets(dataline, DATAMAX, data);
for (int n = 0; n<SEATS && fgets(dataline, DATAMAX, data) ; n++)
if (dataline[SOLDPOS] == 'S')
{
int pos = NAMEPOS;
int length;
seat[n].sold = 1;
char temp[NMAX];
memset(temp, '\0', NMAX);
for (int m = 0; isalpha(dataline[pos]); m++, pos++)
temp[m] = dataline[pos];
pos++;
length = strlen(temp) + 1;
seat[n].fname = (char *)malloc(length);
strcpy_s(seat[n].fname, length, temp);
memset(temp, '\0', NMAX);
for (int m = 0; isalpha(dataline[pos]); m++, pos++)
temp[m] = dataline[pos];
length = strlen(temp) + 1;
seat[n].lname = (char *)malloc(length);
strcpy_s(seat[n].lname, length, temp);
}
}
int choose_flight(void)
{
int flight;
do {
printf("Please enter the label of the flight you want to process.\n");
for (int n = 0; n < FLIGHTNUM; n++)
printf("%d)%s\n", n + 1, flight_list[n]);
printf("5)quit ");
scanf_s("%d", &flight);
getchar();
printf("\n");
if (flight>5 && flight<0)
{
printf("Input error. Please try again.\n");
continue;
}
} while (flight > 5 && flight < 1);
if (flight == 5)
printf("Bye!");
return (flight-1);
}
void deln(char *str)
{
int n = 0;
while (1)
{
if (str[n] == '\n')
{
str[n] = '\0';
break;
}
n++;
}
}
void getname(struct plane * one)
{
char temp[NMAX];
int length;
printf("Please enter the passenger's first name:");
fgets(temp, NMAX, stdin);
deln(temp);
length = strlen(temp) + 1;
one->fname = (char *)malloc(length);
strcpy_s(one->fname, length, temp);
printf("Please enter the passenger's last name:");
fgets(temp, NMAX, stdin);
deln(temp);
length = strlen(temp) + 1;
one->lname = (char *)malloc(length);
strcpy_s(one->lname, length, temp);
}
char menu(void)
{
char choice;
printf("To choose a function, enter its letter label:\n");
printf("a) Show number of empty seats\n");
printf("b) Show list of empty seats\n");
printf("c) Show alphabetical list of seats\n");
printf("d) Assign a customer to a seat assignment\n");
printf("e) Delete a seat assignment\n");
printf("f) Check status of a seat\n");
printf("q) Quit to the menu of choosing the flight. ");
scanf_s("%c", &choice, 1);
getchar();
return choice;
}
void show_empty_number(struct plane *seat)
{
int empty = 0;
for (int n = 0; n < SEATS; n++)
{
if (seat[n].sold)
continue;
empty++;
}
printf("\nThere are %d empty seats.\n\n", empty);
}
void show_empty_list(struct plane *seat)
{
printf("\nEmpty seats:");
for (int n = 0; n < SEATS; n++)
if (!seat[n].sold)
printf("#%d ", seat[n].number);
printf("\n\n");
}
void show_alphabetical_list(struct plane *seat)
{
struct plane temp;
int top, seek;
for (top = 0; top < SEATS - 1; top++)
{
for (seek = top + 1; seek < SEATS; seek++)
{
if (seat[top].sold && seat[seek].sold)
{
if (strcmp(seat[top].fname, seat[seek].fname) > 0)
{
temp = seat[top];
seat[top] = seat[seek];
seat[seek] = temp;
}
if (strcmp(seat[top].lname, seat[seek].lname) == 0 && strcmp(seat[top].lname, seat[seek].lname) > 0)
{
temp = seat[top];
seat[top] = seat[seek];
seat[seek] = temp;
}
}
}
}
for (int n = 0; n < SEATS; n++)
{
if (seat[n].sold)
printf("\n%s %s #%d\n", seat[n].fname, seat[n].lname, seat[n].number);
continue;
}
printf("\n");
}
void add_assign(struct plane *seat)
{
int n;
printf("\nPlease enter the number of the seat:");
scanf_s("%d", &n);
getchar();
if (seat[n - 1].sold)
{
printf("The seat has been sold.\n\n");
return;
}
getname(&seat[n - 1]);
seat[n - 1].sold = 1;
printf("The info has been added.\n\n");
}
void del_assign(struct plane *seat)
{
int n;
printf("\nPlease enter the number you want to delete.");
scanf_s("%d", &n);
getchar();
if (!seat[n - 1].sold)
{
printf("It hasn't been sold.\n\n");
return;
}
seat[n - 1].sold = 0;
clean_name(&seat[n]);
printf("The assignment has been deleted.\n\n");
}
void check_status(int f,struct plane *seat)
{
int n;
printf("\nEnter the seat number you want to check.");
scanf_s("%d", &n);
getchar();
printf("%s :#%d %s %s %s\n\n", flight_list[f], n, (seat[n-1].sold) ? "Sold " : "Empty", seat[n-1].fname, seat[n-1].lname);
}
void numsort(struct plane *seat)
{
struct plane temp;
int top, seek;
for (top = 0; top < SEATS - 1; top++)
{
for (seek = top + 1; seek < SEATS; seek++)
{
if (seat[top].number > seat[seek].number)
{
temp = seat[top];
seat[top] = seat[seek];
seat[seek] = temp;
}
}
}
}
问题已解决。
在调用numsort函数前加一个 if(flight != 4)
报错信息和执行流程呢