How do I write a code to verify that the filename entered by the user ends in .txt?

This is what I have so far.

filename = input('Enter your filename ending in .txt: ', 's');
s1 = '.txt';
s2 == 'filename'
 
tf == strcmp(s1,s2)
 
if tf == 0
    filename = input('Enter your filename ending in .txt: ', 's');
end

Thanks!

Answer 1

[Greg]

filename = input('Enter your filename ending in .txt: ', 's');
s1 = '.txt';
s2 == 'filename' % <-- I think you're confused on = versus == here
 
tf == strcmp(s1,s2) % <-- and here
 
if tf == 0
    filename = input('Enter your filename ending in .txt: ', 's');
end

You can achieve this quite simply with:

filename = input(___);
while ~endsWith(filename,".txt")
    filename = input(___);
end

endsWith was introduced in R2016b, and double quotes to create strings in R2017a.

[Elaine Collins]

That was much easier, thank you!

[Greg]

Happy to help!