Can you help with building a C$++$ program for file comparison. That can be efficient and work with large files.

requirements:

$1.$ the program should open two files that can ignore line breaks

$2.$ the program should run through the files and identify difrences or if same

$3.$ the program should print out the line and column for location purposes

$4.$ the program should give error if one file is longer or shorter than the other file

$5.$ the program should countinue running to countinue looking for diffrences if it encounters one

$6.$ the program should print where the issue has appeared in the text

$7.$ the program can countinue checking after the diffrence line of characters is presented unless there is a better way$`$

Example file $1($Is much more complex$)$:

abc$123$abc$123$abc$123$abc$123$abc$123$abc$123$abc$123$abc$123$abc$123$abc$123$abc$123$abc$123$

Example file $2($Is much more complex$)$:

abc$123$

abc$123$

abc$123$

abc$123$

abc$123$

abc$123$

abc$123$

abc$123$

abc$123$

abc$123$

abc$123$

abc$123$

Wanted output of program or something close to this:

if same:

file$1.$txt and file$2.$txt are identical.

$-------------------------------------------------------$

if diffrent:

file$1.$txt and file$2.$txt are diffrent.

Occurance $1$:

file$1.$txt has an occurance at line: # column: #

Diffrence present in:

$****************************************$

$^$

file$2.$txt has an occurance at line: # column: #

Diffrence present in:

$****************************************$

$^$

$-------------------------------------------------------$

if diffrent:

file$1.$txt and file$2.$txt are diffrent.

Occurance $2$:

file$1.$txt has an occurance at line: # column: #

Diffrence present in:

$****************************************$

$^$

file$2.$txt has an occurance at line: # column: #

Diffrence present in:

$****************************************$

$^$

$-------------------------------------------------------$

etc.

I received this code from an expert but it does not work. and not sure how to fix it$.$

#include

#include

void compareFiles$($const std::string& file$1,$ const std::string& file$2)\{$

std::ifstream stream$1($file$1)$;

std::ifstream stream$2($file$2)$;

if $(!$stream$1||!$stream$2)\{$

std::cerr $$ "Error opening files." $$ std::endl;

return;

$\}$

std::string line$1,$ line$2$;

int lineNum $=0$;

while $($std::getline$($stream$1,$ line$1)$ && std::getline$($stream$2,$ line$2))\{$

lineNum$++$;

$//$ Ignore line breaks and compare line content

size$\_$t pos $=0$;

while $(($pos $=$ line$1.$find$\_$first$\_$not$\_$of$("\backslash$t$\backslash$r

$",$ pos$))!=$ std::string::npos$)\{$

$//$ Check if characters are different

if $($line$1[$pos$]!=$ line$2[$pos$])\{$

std::cout $$ "Files are different. Occurrence $"$ lineNum : $"$ std::endl;

std::cout $$ file has an occurrence at line: $"$ lineNum column: $"$ pos $+1$ std::endl;

std::cout $$ "Difference present in:$"$ std::endl;

std::cout $$ line$1$ std::endl;

std::cout $$ std::string$($pos std::endl;

std::cout $$ file has an occurrence at line: $"$ lineNum column: $"$ pos $+1$ std::endl;

std::cout $$ "Difference present in:$"$ std::endl;

std::cout $$ line$2$ std::endl;

std::cout $$ std::string$($pos std::endl;

break;

$\}$

pos$++$;

$\}$

$\}$

$//$ Check if one file is longer than the other

if $($stream$1.$eof$()$ && $!$stream$2.$eof$())\{$

std::cout $$ "Files are different. $"$ file is shorter than $"$ file$2$ std::endl;

$\}$ else if $(!$stream$1.$eof$()$ && stream$2.$eof$())\{$

std::cout $$ "Files are different. $"$ file is longer than $"$ file$2$ std::endl;

$\}$ else $\{$

std::cout $$ "Files are identical." $$ std::endl;

$\}$

$\}$

int main$()\{$

std::string file$1=$ "Text$/$largeFile$.$txt$"$;

std::string file$2=$ "Text$/$largeFile$2.$txt$"$;

compareFiles$($file$1,$ file$2)$;

return $0$;

$\}$

running it with a small files that should be identical it gives an error where it should not as you can see in the output below per the program not ignoring line breaks:

$*$

$./$zip

Files are different. Occurrence $1$:

Text$/$match$1.$txt has an occurrence at line: $1$ column: $7$

Difference present in:

abc$123$abc$123$abc$123$

$^$

Text$/$match$2.$txt has an occurrence at line: $1$ column: $7$

Difference present in:

abc$123$

$^$

Files are different. Text$/$match$1.$txt is shorter than Text$/$match$2.$txt

$*$

And running with a large files it just runs non stop and just prints the files nonstop.