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How to read element of line of file

 
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Old 04-19-2008
How to read element of line of file
Hi,

I would like to get elements in data in a file.

My file data would be something like:-

foo 123.32 323 4356.234 22344.9
fon 234.454 3434 2362.3 34

...etc..

I would like to read the elements in this file each line by line and write onto another text file.

I am using getline to get these data from line by line basis. However, for element basis, I would like to use istream_iterator vector to store these values but im not sure how I could use that since vector only permits one type of data type. Instead, my data has mixture of string, float and ints data.

Another alternative im thinking would be using istringstream obj(line)

and then declare each element variable's data type before
obj>>a>>b>>c>>d>>e

But Im not too sure it is working or correct concept. Please help.

Thanks.
 
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LEARN ABOUT OSX

lreplace

lreplace(n)						       Tcl Built-In Commands						       lreplace(n)

__________________________________________________________________________________________________________________________________________________

NAME

       lreplace - Replace elements in a list with new elements

SYNOPSIS

       lreplace list first last ?element element ...?
_________________________________________________________________

DESCRIPTION

       lreplace  returns  a new list formed by replacing one or more elements of list with the element arguments.  first and last are index values |
       specifying the first and last elements of the range to replace.	The index values first and last are interpreted the same as  index  values |
       for  the  command string index, supporting simple index arithmetic and indices relative to the end of the list.	0 refers to the first ele- |
       ment of the list, and end refers to the last element of the list.  If list is empty, then first and last are ignored.

       If first is less than zero, it is considered to refer to before the first element of the list.  For non-empty lists, the element  indicated
       by first must exist or first must indicate before the start of the list.

       If  last  is  less  than first, then any specified elements will be inserted into the list at the point specified by first with no elements
       being deleted.

       The element arguments specify zero or more new arguments to be added to the list in place of those that were deleted.  Each  element  argu-
       ment  will become a separate element of the list.  If no element arguments are specified, then the elements between first and last are sim-
       ply deleted.  If list is empty, any element arguments are added to the end of the list.

EXAMPLES

       Replacing an element of a list with another:
	      % lreplace {a b c d e} 1 1 foo
	      a foo c d e

       Replacing two elements of a list with three:
	      % lreplace {a b c d e} 1 2 three more elements
	      a three more elements d e

       Deleting the last element from a list in a variable:
	      % set var {a b c d e}
	      a b c d e
	      % set var [lreplace $var end end]
	      a b c d

       A procedure to delete a given element from a list:
	      proc lremove {listVariable value} {
		  upvar 1 $listVariable var
		  set idx [lsearch -exact $var $value]
		  set var [lreplace $var $idx $idx]
	      }

SEE ALSO

       list(n), lappend(n), lindex(n), linsert(n), llength(n), lsearch(n), lset(n), lrange(n), lsort(n), string(n)				   |

KEYWORDS

       element, list, replace

Tcl									7.4							       lreplace(n)