问题描述
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 %sn', 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 9struct 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)%sn', 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 seatsn'); printf('b) Show list of empty seatsn'); printf('c) Show alphabetical list of seatsn'); printf('d) Assign a customer to a seat assignmentn'); printf('e) Delete a seat assignmentn'); printf('f) Check status of a seatn'); 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.nn', 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('nn');}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 #%dn', 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.nn');return; } getname(&seat[n - 1]); seat[n - 1].sold = 1; printf('The info has been added.nn');}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.nn');return; } seat[n - 1].sold = 0; clean_name(&seat[n]); printf('The assignment has been deleted.nn');}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 %snn', 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。
问题解答
回答1：在调用numsort函数前加一个 if(flight != 4)
回答2：报错信息和执行流程呢
