adding books to book list

ı have a books.txt which has book names inside like AC521 In_Praise_of_Stay-at-Home_Moms ACTION. firstly code then name and book's genre. ı want to add new book in this list how ı can make this. ı write this code

[Code,Name,Genre] = textread( 'books.txt', '%s %s %s' )

fprintf("1-ADD BOOK\n2-DELETE BOOK\n3-LIST OF BOOKS\n4-LIST OF GENRE\n5-SEARCH BOOK BY NAME\n6-PLOT HISTOGRAM\n0-EXIT\n")

n=input("Enter your Choice:")

if n==1

fid=fopen('books.txt', 'a');

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/538623-reading-lines-from-text-file#comment_875623

[Walter Roberson]

I recommend that you hold pff opening the output file until you have obtained all the inputs from the user and validated them.

[Walter Roberson]

By the way, have a look at menu() instead of your fprintf() / input()

Answer 1

[Walter Roberson]

fprintf(fid, '%s %s %s\n', NewCode, NewName, NewGenre) ;

[Mehmet Kaptan]

it is saying newcodr is not defined. how ı can fix that

[Image Analyst]

You have to define those variables for the new book that you want to add.

NewCode = '12345';
NewName = 'Handbook of Image Processing';
NewGenre = 'MATLAB';

or whatever they may be.

[Mehmet Kaptan]

but ı have to add many books. ı guess ı need a loop

[Walter Roberson]

Adding a lot of books through the kind of input structure you have is going to be tedious for the user. It would be easier if you could read the information about the new books from a file.