编程环境Visual Studio 2017
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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <ctype.h> #include <math.h> // practice 1 typedef struct MONTH_INFO { char month[4]; int month_days; int month_number; } ST_MONTH_INFO; #define N_MONTH 12 const ST_MONTH_INFO info[N_MONTH] = { {"Jan", 31, 1}, {"Feb", 28, 2}, {"Mar", 31, 3}, {"Apr", 30, 4}, {"May", 31, 5}, {"Jun", 30, 6}, {"Jul", 31, 7}, {"Aug", 31, 8}, {"Sep", 30, 9}, {"Oct", 31, 10}, {"Nov", 30, 11}, {"Dec", 31, 12} }; void p14_1(void) { char month[4]; int total_days = 0; _Bool find = 0; printf("Enter the abbreviation of month:"); fgets(month, 4, stdin); for (int i = 0; i < N_MONTH; i++) { total_days += info[i].month_days; if (strcmp(month, info[i].month) == 0) { find = 1; break; } } if (find == 1) printf("There are %d days till %s\n", total_days, month); else printf("The month of addreviation is not found!\n"); return; } // practice 2 void p14_2(void) { char month[4]; int days = 0; int total_days = 0; _Bool find = 0; int i = 0; while (find == 0) { total_days = 0; printf("Enter the abbreviation of month:"); fgets(month, 4, stdin); for (i = 0; i < N_MONTH; i++) { total_days += info[i].month_days; if (strcmp(month, info[i].month) == 0) { find = 1; break; } } if (find == 1) printf("There are %d days till %s\n", total_days, month); else printf("The month of addreviation is not found! Enter again.\n"); } find = 0; while (find == 0) { printf("Enter the days of month:"); scanf("%d", &days); if (days < info[i].month_days) { total_days += days; find = 1; printf("There %d days till %s %d\n", total_days, month, days); } else printf("The day of month is not found! Enter again.\n"); } return; } // practice 3 char *s_gets(char *st, int n) { char *ret_val; char *find; ret_val = fgets(st, n, stdin); if (ret_val) { find = strchr(st, '\n'); if (find) { *find = '\0'; } else { while (getchar() != '\n') { continue; } } } return ret_val; } #define MAXTITL 40 #define MAXAUTL 40 #define MAXBKS 100 struct book { char title[MAXTITL]; char author[MAXAUTL]; float value; // 下面一个变量用于practice 7,在practice 3时可以先删除 int delete; }; void p14_3(void) { struct book library[MAXBKS]; int count = 0; int index; printf("Please enter the book title.\n"); printf("Please [enter] at the start of a line to stop.\n"); while (count < MAXBKS && s_gets(library[count].title, MAXTITL) != NULL && library[count].title[0] != '\0') { printf("Now enter the author.\n"); s_gets(library[count].author, MAXAUTL); printf("Now enter the value.\n"); scanf("%f", &library[count++].value); while (getchar() != '\n') { continue; } if (count < MAXBKS) { printf("Enter the next title.\n"); } } if (count > 0) { printf("Here is the list of your books:\n"); printf("Array by original:\n"); for (index = 0; index < count; index++) { printf("%s by %s: $%.2f\n", library[index].title, library[index].author, library[index].value); } printf("\n"); printf("Array by title:\n"); for (int i = 0; i < count; i++) { for (int j = i; j < count; j++) { if (strcmp(library[i].title, library[j].title) > 0) { struct book tmp = library[i]; library[i] = library[j]; library[j] = tmp; } } } for (index = 0; index < count; index++) { printf("%s by %s: $%.2f\n", library[index].title, library[index].author, library[index].value); } printf("\n"); printf("Array by value:\n"); for (int i = 0; i < count; i++) { for (int j = i; j < count; j++) { if (library[i].value > library[j].value) { struct book tmp = library[i]; library[i] = library[j]; library[j] = tmp; } } } for (index = 0; index < count; index++) { printf("%s by %s: $%.2f\n", library[index].title, library[index].author, library[index].value); } printf("\n"); } else printf("No books? Too bad.\n"); return; } // practice 4 struct name_info { char first_name[32]; char last_name[32]; char mid_name[32]; }; struct member_info { char insuran_number[32]; struct name_info name; }; void p14_4a(struct member_info *member) { for (int i = 0; i < 5; i++) { printf("%s, %s", member[i].name.first_name, member[i].name.last_name); if (member[i].name.mid_name[0] != '\0') { printf(" %s.", member[i].name.mid_name); } printf(" -- %s\n", member[i].insuran_number); } } void p14_4b(struct member_info member) { printf("%s, %s", member.name.first_name, member.name.last_name); if (member.name.mid_name[0] != '\0') { printf(" %s.", member.name.mid_name); } printf(" -- %s\n", member.insuran_number); } void p14_4(void) { struct member_info member[5] = { {"302039823", {"Dribble", "FLossie", "M"}}, {"302039824", {"Hello", "Kitty"}}, {"302039285", {"Hello", "Jimmy", "J"}}, {"302039286", {"Good", "Job"}}, {"302039287", {"Jump", "High", "J"}} }; // a //p14_4a(member); // b for (int i = 0; i < 5; i++) { p14_4b(member[i]); } return; } // practice 5 struct name { char first_name[32]; char last_name[32]; }; struct student { struct name student_name; double grade[3]; double average; }; #define CSIZE 4 void p14_5(void) { struct student students[CSIZE]; // d for (int i = 0; i < CSIZE; i++) { printf("Enter the student's first name: "); s_gets(students[i].student_name.first_name, 32); printf("Enter the student's last name: "); s_gets(students[i].student_name.last_name, 32); printf("Enter three grades of this student: "); for (int j = 0; j < 3; j++) { scanf("%lf", &students[i].grade[j]); } getchar(); // 换行符还在缓冲区里 } // e for (int i = 0; i < CSIZE; i++) { double total_grade = 0.0; for (int j = 0; j < 3; j++) { total_grade += students[i].grade[j]; } students[i].average = total_grade / 3; } // f for (int i = 0; i < CSIZE; i++) { printf("Student: %s, %s, grade: %.2lf, %.2lf, %.2lf, average: %.2lf\n", students[i].student_name.first_name, students[i].student_name.last_name, students[i].grade[0], students[i].grade[1], students[i].grade[2], students[i].average); } // g double total_grades = 0.0; for (int i = 0; i < CSIZE; i++) { total_grades += students[i].average; } printf("All students' average grade is %.2lf\n", total_grades / CSIZE); return; } // practice 6 struct softball_player { char first_name[128]; char last_name[128]; int play_times; int hit_times; int run_bar_times; int rbi; double hit_rate; }; void p14_6(void) { struct softball_player players[19] = { {'\0', '\0', 0, 0, 0, 0, 0.0} }; FILE *fp; char file_name[128]; struct softball_player player; int player_number; printf("Enter the file name: "); s_gets(file_name, 128); if ((fp = fopen(file_name, "r")) == NULL) { printf("Can't open the %s.\n", file_name); } while (feof(fp) == 0) { fscanf(fp, "%d", &player_number); fscanf(fp, "%s", &player.first_name); fscanf(fp, "%s", &player.last_name); fscanf(fp, "%d", &player.play_times); fscanf(fp, "%d", &player.hit_times); fscanf(fp, "%d", &player.run_bar_times); fscanf(fp, "%d", &player.rbi); if (players[player_number].first_name[0] == '\0') { players[player_number] = player; } else { players[player_number].play_times += player.play_times; players[player_number].hit_times += player.hit_times; players[player_number].run_bar_times += player.run_bar_times; players[player_number].rbi += player.rbi; } } for (int i = 0; i < 19; i++) { if (players[i].first_name[0] != '\0') { players[i].hit_rate = (double)players[i].hit_times / players[i].play_times; } } for (int i = 0; i < 19; i++) { if (players[i].first_name[0] != '\0') { printf("Player:%s %s, play times: %d, hit times: %d, run barrier times: %d, rbi: %d, hit_rate: %.2lf\n", players[i].first_name, players[i].last_name, players[i].play_times, players[i].hit_times, players[i].run_bar_times, players[i].rbi, players[i].hit_rate); } } } // practice 7 // 结构的定义和宏定义都在practice 3中，这里就不再另外定义 void p14_7(void) { struct book library[MAXBKS] = { {'\0', '\0', 0.0, 0} }; int count = 0; int index, filecount; FILE *pbooks; int size = sizeof(struct book); if ((pbooks = fopen("book.dat", "r+b")) == NULL) { fputs("Can't open book.dat file\n", stderr); } rewind(pbooks); while (count < MAXBKS && fread(&library[count], size, 1, pbooks) == 1) { if (count == 0) { puts("Current contents of boot.dat:"); } printf("%s by %s: $%.2f\n", library[count].title, library[count].author, library[count].value); count++; } filecount = count; if (count == MAXBKS) { fputs("The book.dat file is null.", stderr); } printf("Please enter the book.dat title.\n"); printf("Please [enter] at the start of a line to stop.\n"); while (count < MAXBKS && s_gets(library[count].title, MAXTITL) != NULL && library[count].title[0] != '\0') { printf("Now enter the author.\n"); s_gets(library[count].author, MAXAUTL); printf("Now enter the value.\n"); scanf("%f", &library[count++].value); while (getchar() != '\n') { continue; } if (count < MAXBKS) { printf("Enter the next title.\n"); } } if (count > 0) { printf("Here is the list of your books:\n"); for (index = 0; index < count; index++) { printf("%d: %s by %s: $%.2f\n", index + 1, library[index].title, library[index].author, library[index].value); } } else puts("No books? Too bad.\n"); while (1) { int item; char ch; printf("Which book do you want to delete or modify(-1 to exit)?"); scanf("%d", &item); while (getchar() != '\n') { continue; } if (item == -1) { break; } printf("[D]elete or [M]dify?"); scanf("%c", &ch); while (getchar() != '\n') { continue; } if (ch == 'D') { library[item - 1].delete = 1; } else { printf("Please enter the book title.\n"); s_gets(library[item - 1].title, MAXTITL); printf("Now enter the author.\n"); s_gets(library[item - 1].author, MAXAUTL); printf("Now enter the value.\n"); scanf("%f", &library[item - 1].value); while (getchar() != '\n') { continue; } } } // 关闭再以只读打开文件后可以完全清空文件 fclose(pbooks); if ((pbooks = fopen("book.dat", "w")) == NULL) { printf("Can't open boot.dat file\n"); } for (int i = 0; i < count; i++) { if (library[i].delete != 1) { fwrite(&library[i], size, 1, pbooks); } } puts("Done.\n"); fclose(pbooks); return; } // practice 8 #define TOTAL_SEAT 12 struct seat { int seat_number; int book; char first_name[128]; char last_name[128]; }; void show_empty_seat(struct seat *airplane) { int seats = 0; for (int i = 0; i < TOTAL_SEAT; i++) { if (airplane[i].book == 0) { seats++; } } printf("There are %d empty seats.\n", seats); return; } void list_empty_seat(struct seat *airplane) { printf("List empty seat:"); for (int i = 0; i < TOTAL_SEAT; i++) { if (airplane[i].book ==0) { printf(" %d", airplane[i].seat_number); } } printf("\n"); } void show_alphabetical(struct seat *airplane) { printf("Show alphabetical:\n"); for (int i = 0; i < TOTAL_SEAT; i++) { if (airplane[i].book == 1) { printf("%d booked by %s %s.\n", airplane[i].seat_number, airplane[i].first_name, airplane[i].last_name); } } } void book_seat(struct seat *airplane) { int seat_number = 0; while (1) { printf("Enter the seat number you want to book:"); scanf("%d", &seat_number); seat_number -= 1; while (getchar() != '\n'); if (airplane[seat_number].book == 1) { printf("Seat %d is not empty, please enter again.\n", seat_number+1); } else { break; } } printf("Enter the customer first name:"); s_gets(airplane[seat_number].first_name, 128); printf("Enter the customer last name:"); s_gets(airplane[seat_number].last_name, 128); airplane[seat_number].book = 1; return; } void delete_seat(struct seat *airplane) { int seat_number; printf("Enter the seat assigment you want to delete:"); scanf("%d", &seat_number); getchar(); airplane[seat_number-1].book = 0; } void p14_8(void) { struct seat airplane_seats[TOTAL_SEAT] = { {0, 0, '\0', '\0'} }; char choice; for (int i = 0; i < TOTAL_SEAT; i++) { airplane_seats[i].seat_number = i + 1; airplane_seats[i].book = 0; airplane_seats[i].first_name[0] = '\0'; airplane_seats[i].last_name[0] = '\0'; } while (1) { printf("To choose a function, enter its letter lable:\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 assigment\n"); printf("e) Delete a seat assignment\n"); printf("f) Quit\n"); scanf("%c", &choice); getchar(); if (choice == 'f') { break; } switch (choice) { case 'a': show_empty_seat(airplane_seats); break; case 'b': list_empty_seat(airplane_seats); break; case 'c': show_alphabetical(airplane_seats); break; case 'd': book_seat(airplane_seats); break; case 'e': delete_seat(airplane_seats); break; default: break; } } } // practice 9 // 确认座位分配选项不知道用来做什么的，没理解，所以就不做了 #define TOTAL_FLIGHT 4 void p14_9(void) { struct seat airplane_seats[TOTAL_FLIGHT][TOTAL_SEAT] = { { 0, 0, '\0', '\0' } }; struct seat *flight_select = NULL; char choice; for (int i = 0; i < TOTAL_FLIGHT; i++) { for (int j = 0; j < TOTAL_SEAT; j++) { airplane_seats[i][j].seat_number = j + 1; airplane_seats[i][j].book = 0; airplane_seats[i][j].first_name[0] = '\0'; airplane_seats[i][j].last_name[0] = '\0'; } } while (1) { char flight[4]; printf("Which flight you want to select: 102, 311, 444 or 519: "); scanf("%s", flight); getchar(); if (strcmp("102", flight) == 0) { flight_select = airplane_seats[0]; } else if (strcmp("311", flight) == 0) { flight_select = airplane_seats[1]; } else if (strcmp("444", flight) == 0) { flight_select = airplane_seats[2]; } else if (strcmp("519", flight) == 0) { flight_select = airplane_seats[3]; } while (1) { printf("To choose a function, enter its letter lable:\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 assigment\n"); printf("e) Delete a seat assignment\n"); printf("f) Quit\n"); scanf("%c", &choice); getchar(); if (choice == 'f') { break; } switch (choice) { case 'a': show_empty_seat(flight_select); break; case 'b': list_empty_seat(flight_select); break; case 'c': show_alphabetical(flight_select); break; case 'd': book_seat(flight_select); break; case 'e': delete_seat(flight_select); break; default: break; } } } } // practice 10 void p14_10a(void) { printf("p14_10a()\n"); } void p14_10b(void) { printf("p14_10b()\n"); } void p14_10c(void) { printf("p14_10c()\n"); } void p14_10(void) { char choice = 0; void(*fun[3])(void) = { p14_10a, p14_10b, p14_10c }; printf("Enter you choice:\n"); printf("a) p14_10a()\n"); printf("b) p14_10b()\n"); printf("c) p14_10c()\n"); scanf("%c", &choice); getchar(); switch (choice) { case 'a': fun[0](); break; case 'b': fun[1](); break; case 'c': fun[2](); break; default: break; } } // practice 11 double mul2(double x) { return (x * 2.0); } double mul1(double x) { return (x * x); } void transform(double *source, double *target, int num, double (*fun)(double)) { for (int i = 0; i < num; i++) { target[i] = fun(source[i]); } } void p14_11(void) { double source[100]; double target[100]; for (int i = 0; i < 100; i++) { source[i] = i; } printf("Use sqr:\n"); transform(source, target, 100, sqrt); for (int i = 0; i < 100; i++) { printf("%.2lf ", target[i]); if ((i + 1) % 10 == 0) { printf("\n"); } } printf("Use sin:\n"); transform(source, target, 100, sin); for (int i = 0; i < 100; i++) { printf("%.2lf ", target[i]); if ((i + 1) % 10 == 0) { printf("\n"); } } printf("Use mul2:\n"); transform(source, target, 100, mul2); for (int i = 0; i < 100; i++) { printf("%.2lf ", target[i]); if ((i + 1) % 10 == 0) { printf("\n"); } } printf("Use sqr:\n"); transform(source, target, 100, mul1); for (int i = 0; i < 100; i++) { printf("%.2lf ", target[i]); if ((i + 1) % 10 == 0) { printf("\n"); } } } int main(int argc, char **argv) { p14_11(); while (getchar()); return 0; } |
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我也不知确认座位分配是干嘛用的 ，刚还想看博主的是怎么做的，原来也不知道
