Thread: Ignoring the Tab at the begining of the line..

Ignoring the spaces and the Tab.

Hi guys,
I am writing a C++ program under Linux, in this program I am reading a file, and I want to ignore the Tab and comments ( the line which start by #).

I solve the problem with the comment lines, but how can I ignore the TAB at the beginning of some lines.

Code:

File1.txt
#This is the first part
	Command1.  ! subcomment
	Command2.
	Command3.
	Command4  
#This is the second part
	Command5   ! subcomment
	Command6
#The End.

Thank you for your help.

I am using C++ method.

Post some of what you've tried so far.

use ascii value to check if current char is tab..
http://www.asciitable.com/
or u could use isspace() this will check for tab..
but in the other hand it wil check for space to...
but u could do double check to see if is really a space or tab..
just a suggestion..

>>use ascii value to check if current char is tab..
Better still, just use \t

Here is a part of my code:

Code:

string open( sting file_name)
/*
* open the file
* read the lines one by one
* delete the comeents ( lines or after the command
* ignor the TAB at the begining.
*/
{
fstrem in_file;
in_file.open(file_name.c_str(), ios::in)

int lines= 0;
string code_line;

getline(in_file, code_line);
while(!in_file.eof())
    //handel Empty lines
    while(code_line.size() == 0 && !in_file.eof()){
       getline(in_file, code_line);
       lines ++;
    }
    
    // handel Comments after the command
    if( line_code.find("!") != -1){
      line_code= line_code.erase(line_code.find("!"), line_code.size());
    }
    // handel comment lines.
    while((strcmp(line_code.c_str)(,"")==) && !in_file.eof()){
       getline(in_file, line_code);
       lines++;
    }
    // reading from the file and ignoring the TAB.
    /*
    I don't know how to do it
    */
    cout<<" Thank you for your help";
    
    //end of function open and read the file
    
}

The project is very big but I want the input file to look nice, so I thought about having a TAB, but I end up having this problem.

I want to learn how to deal with TABs at the begining of the lines for future as well.

Thank you for your help and support.

Wouldn't searching the file for all occurances of the tab ASCII character and removing them work?

Edit: Or are they done as individual spaces? In that case...you could run a search for every occurance of (newline) five spaces in a row and replace it with just (newline)