How to store users input in a file?
8 views (last 30 days)
Show older comments
Let's say I made a input asking for the users name and age, and wanted to say his input to a .txt file, I already know how to do that but my issue is how to keep that stored data if the script was ran again.
my code to store the users name and age:
name = input('What is your name? ','s');
age = input('How old are you? ');
fid = fopen('data.txt','w');
fprintf(fid,'%s is %i years old\n',name,age);
fclose(fid);
0 Comments
Answers (2)
Star Strider
on 31 May 2024
If you want to read the file, try something like this —
% name = input('What is your name? ','s');
% age = input('How old are you? ');
name = 'Rumpelstiltskin';
age = 142;
fid = fopen('data.txt','w');
fprintf(fid,'%s is %d years old\n',name,age);
fclose(fid);
type('data.txt')
fid = fopen('data.txt','rt');
out = textscan(fid,'%s is %d years old\n');
fclose(fid);
out{1}
out{2}
.
2 Comments
Star Strider
on 31 May 2024
I was not sure what you were asking.
One option would be to overwrite the file, and another would be to append to it.
Steven Lord
on 31 May 2024
You want to open the file not in write mode ('w') but in append mode ('a'). See the description of the permission input argument on the documentation page for the fopen function. Since you're writing text data to the file you probably also want to add 't' to write in text mode, so 'at' instead of 'w'.
cd(tempdir)
fid = fopen('myfile.txt', 'wt'); % open for writing
fprintf(fid, "Hello world!\n");
fclose(fid);
type myfile.txt
fid = fopen('myfile.txt', 'at'); % open for appending
fprintf(fid, "This is a second line.\n");
fclose(fid);
type myfile.txt
fid = fopen('myfile.txt', 'wt'); % open for writing, discarding the existing contents
fprintf(fid, "Is this the third line? Guess not.");
fclose(fid);
type myfile.txt
See Also
Categories
Find more on Structures in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!