c file to extract real value from a txt file


 
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# 8  
Old 02-04-2008
Quote:
Originally Posted by user_prady
Dear Friends,

I am really in a great problem.
My problem is as follows

If I will send a counter to a function in c like read_line(counter);

Then it will read that line only which counter is pointing ,
Suppose I ve txt file like below

abc.txt
12.1
13.2
14.4

Then If I'll call the function as read_line(2);

It should read the 2nd line only and then put that value to a double pointer..

I mean one function call should read only the specified row,, and store it to a double pointer..

I need help badly..
One way you could do this is by moving the sscanf part of the code into the read_line() function. This way you just need to increment the variable by 1 after every call to fgets. After calling fgets you can invoke read_line() and pass the counter as an argument to it and inside read_line() the double floating number will be stored at the address specified by the double pointer using sscanf.
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MouseX::NativeTraits::Counter(3pm)			User Contributed Perl Documentation			MouseX::NativeTraits::Counter(3pm)

NAME
MouseX::NativeTraits::Counter - Helper trait for counter attributes SYNOPSIS
package MyHomePage; use Mouse; has 'counter' => ( traits => ['Counter'], is => 'ro', isa => 'Num', default => 0, handles => { inc_counter => 'inc', dec_counter => 'dec', reset_counter => 'reset', }, ); my $page = MyHomePage->new(); $page->inc_counter; # same as $page->counter( $page->counter + 1 ); $page->dec_counter; # same as $page->counter( $page->counter - 1 ); DESCRIPTION
This module provides a simple counter attribute, which can be incremented and decremented. If your attribute definition does not include any of is, isa, default or handles but does use the "Counter" trait, then this module applies defaults as in the "SYNOPSIS" above. This allows for a very basic counter definition: has 'foo' => (traits => ['Counter']); $obj->inc_foo; PROVIDED METHODS
These methods are implemented in MouseX::NativeTraits::MethodProvider::Counter. It is important to note that all those methods do in place modification of the value stored in the attribute. set($value) Set the counter to the specified value. inc Increments the value stored in this slot by 1. Providing an argument will cause the counter to be increased by specified amount. dec Decrements the value stored in this slot by 1. Providing an argument will cause the counter to be increased by specified amount. reset Resets the value stored in this slot to it's default value. METHODS
meta method_provider_class helper_type SEE ALSO
MouseX::NativeTraits perl v5.14.2 2011-12-04 MouseX::NativeTraits::Counter(3pm)