include stdio include math include stdlib include string define 15 str

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#define N 15

struct libary {
    int AllCount;
    struct books {
        char author[N];
        char name[N];
        char code[N];
    } AllBooks[N*N*N];
} lib;
int i;
void addLine() {
    char a[N],b[N],c[N];
    printf("Write author's name: ");
    scanf("%s", a);
    printf("Write book's name: ");
    scanf("%s", b);
    printf("Write book's code: ");
    scanf("%s", c);
    strcpy(lib.AllBooks[ lib.AllCount ].author, a);
    strcpy(lib.AllBooks[ lib.AllCount ].name, b);
    strcpy(lib.AllBooks[ lib.AllCount ].code, c);
    lib.AllCount++;
}

void showLines() {
    printf("Num %15s %14s %15s", "Author", "Name", "Code\n");
    for(i = 0; i < lib.AllCount; i++) {
        printf("%d  %15s %15s %15s \n", i+1,
                lib.AllBooks[i].author, lib.AllBooks[i].name, lib.AllBooks[i].code );
    }
}

void deleteLine() {
    int number;
    showLines();
    printf("Type line number: ");
    scanf("%d", &number);
    if(number > 0 && number <= lib.AllCount ) {
        number--;
        for(i = number; i < lib.AllCount - 1; i++) {
            strcpy(lib.AllBooks[ i ].author, lib.AllBooks[ i + 1 ].author);
            strcpy(lib.AllBooks[ i ].name, lib.AllBooks[ i + 1 ].name);
            strcpy(lib.AllBooks[ i ].code, lib.AllBooks[ i + 1 ].code);
        }
        lib.AllCount--;
    }
}

void editLine() {
    char a[N];
    int number, field;
    showLines();
    printf("Type line number: ");
    scanf("%d", &number);
    printf("1. Author\n");
    printf("2. Name\n");
    printf("3. Code\n");
    printf("Type field number: ");
    scanf("%d", &field);
    if(number > 0 && number <= lib.AllCount && field > 0 && field < 4 ) {
        number--;
        switch(field) {
            case 1:
                printf("Write new author's name: ");
                scanf("%s", a);
                strcpy(lib.AllBooks[ number ].author, a);
                break;

            case 2:
                printf("Write new book's name: ");
                scanf("%s", a);
                strcpy(lib.AllBooks[ number ].name, a);
                break;

            case 3:
                printf("Write new book's code: ");
                scanf("%s", a);
                strcpy(lib.AllBooks[ number ].code, a);
                break;
        }
    }
}

void print() {
    printf("---------------------########---------------------\n");
    printf("1. Add line\n");
    printf("2. Delete line\n");
    printf("3. Show lines\n");
    printf("4. Edit line\n");
    printf("5. Exit\n");
    printf("Choose menu item: ");
}

int main() {
    int type = 0;
    print();
    lib.AllCount = 0;    
    while(scanf("%d", &type)) {
        switch(type) {
            case 1:
                addLine();
                break;
            case 2:
                deleteLine();
                break;
            case 3:
                showLines();
                break;
            case 4:
                editLine();
                break;
            case 5:
                return 0;
        }        
        print();
    }
    return 0;
}