How can I read a matrix contain '?'

I want to read file txt and replace '?' in the current matrix with 0 exempl

File containing this matrix :

A;B;C 
?;7;9      
9;?;1      
1;8;5

==>

A;B;C
0;7;9
9;0;1
1;8;5

Answer 1

[Walter Roberson]

fid = fopen('filename.txt')
d = textscan(fid,'%f%f%f', 'Delimiter', ';', 'TreatAsEmpty', '?', 'EmptyValue', 0, 'CollectOutput', 1)
fclose(fid)
out = d{1};

[MED]

Perfect !!!

Answer 2

[Azzi Abdelmalek]

fid=fopen('filename.txt')
d=textscan(fid,'%s')
fclose(fid)
out=strrep(d{1},'?','0')

[MED]

this out is possible to manipulate it like a matrix not string like ==> out(1,2)

[Azzi Abdelmalek]

Data are imported like shown in your question

[MED]

yes but this is not a matrix this is set of strings i can't manipulate it