Write a function called digit_counter that takes the name of a text file as input and returns the number of digits (i.e., any of the characters, 0-to-9) that the file contains. If there is a problem opening the file, the function returns -1

function[c]=digit_counter(filename)
fid=fopen(filename,'rt');
if fid<0
    error('error opening file %s', filename);

end
A = char(fread(fid,inf)).';
c=length(A);
fclose(fid);
end

Answer 1

[Walter Roberson]

Your code returns the number of bytes in the file. The requirements are that it return the number of digits in the file -- that is, the total number of occurrences of any of the characters '0', '1', '2', '3', '4', '5', '6', '7', '8', or '9'

[Kapil Dhanwani]

Yes I want digits only...no alphabets and no space so what changes I should make

[Walter Roberson]

Hint:

if A(idx) == '0'
  digit0 = digit0 + 1;
elseif ....

Answer 2

[Srishti Saha]

A simple function as this would work:

function n = digit_counter(fname)
    n = -1;
    fid = fopen(fname,'r');
    if fid >= 0
        n = sum(isstrprop(fread(fid,inf,'char=>char'),'digit'));
        fclose(fid);
    end
end

[Walter Roberson]

We discourage giving complete answers for homework questions.