Script to read, error check till user enters a valid file name that can be opened, then print out file name and close file.

I am having the hardest trouble on the loop error-checking part that keeps checking still the user enters a valid filename that can be opened.

This is what I have so far:

% prompt user for name to be read and open
file = input('PLEASE INPUT FILE NAME TO BE READ:','s');
fopen(file,'r');

% loop error-check until valid filename can be opened
% print file name and close file
while fopen(file)~=0
    fpirnt('FILE OPENED IS: %s\n',file);
    fclose(file);
    else
        fprintf('PLEASE INPUT A VALID FILE NAME!\n','s');
        file = input('PLEASE INPUT FILE NAME TO BE READ:','s');

end

what is going wrong?

Thank you!

Answer 1

[Walter Roberson]

'while' does not permit an 'else', so you have a syntax error.

You cannot close a file by name, only by file identifier.

Hint: "break"

[Nora]

% prompt user for name to be read and open file = input('PLEASE INPUT FILE NAME TO BE READ:','s'); fopen(file,'r'); % loop error-check until valid filename can be opened % print file name and close file if fopen(file)~=0 fpirnt('FILE OPENED IS: %s\n',file); fclose(file); else fprintf('PLEASE INPUT A VALID FILE NAME!\n','s'); file = input('PLEASE INPUT FILE NAME TO BE READ:','s'); end

I still get the problem if I use and if-loop. But I don't know how to do the other parts: