Question

please help in matlab!!! Thank you so much in advance!

Modify

fn = input('input file name:', 's' );

ofn = input('output file name: ','s' );

ih = fopen( ifn,'r');

oh = fopen( ofn,'w' );

ln = '';

while ischar( ln )

ln = fgets( ih );

if ischar( ln )

   fprintf( oh, ln );

end

end

fclose( ih );

fclose( oh );

% fprintf( oh, ln ) has a paramter oh of file %handle.

Ln is written to the file instead of %printing on screen

  Please type the names of a source file and a target file. Then copy the content from source file to target file, and display how many lines are copied. For example, if you type ‘t1.txt’ and ‘t1_1.txt’ as source and target file names, the content of ‘t1.txt’ will be copied to ‘t1_1.txt,’ and 6 is displayed to show 6 lines are copied.

(Hint: copying was implemented in the example; you only need to add statements to calculate how many lines are copied.)

Answer 1

fgets read line from the file one at a time. So whenever we read a line, we can increment the count. The final count will be the number of lines in the file.

Here is the modified Matlab code that keeps track of lines and prints it at the end:

ifn = input('input file name:', 's' );

ofn = input('output file name: ','s' );

ih = fopen( ifn,'r');

oh = fopen( ofn,'w' );

ln = '';

newlines = 0; % initialize newline to zero

while ischar( ln )

   ln = fgets( ih );

   if ischar( ln )

       fprintf( oh, ln );

       newlines = newlines + 1; % increment newline

   end

end

fprintf("Total number of lines = %d", newlines); % print number of lines

fclose( ih );

fclose( oh );

Code screenshot:

Input file t1.txt:

Sample IO: