Related File Handeling in C lang.

[shariquehabib]

Hi All,

I want to get some values by reading a file (already created) through file handeling but dont want to get DUPLICATE values.

How can i do that..plz help me out.......

E.g: file name input.txt having rows like:

Root 400
Bye 789
Teacher 123
Bye 789

in output i want to print only :
Root 400
Bye 789
Teacher 123

Note: Dont want to print duplicate data (Teacher 123)

If any idea..plz tell me ...with example too.

--
Sharique

[gpraghuram]

Option 1
You can use unix utilities instead of C code like this
cat input.txt | sort -u

Option 2
You have to read the data push it to a map or set and then print the map.
If you can use C++

Option 3
You have to write a adata structure which will store uniqe values.


Raghu

[shariquehabib]

Hi Raghu,

I have to use only C file handeling...i cant change this.
Can u plz give me small example to select only distinct values from file which we ae opening thru file handeling...

if possible plz give me peice of prog.

Thanks,
Sharique

Option 1
You can use unix utilities instead of C code like this
cat input.txt | sort -u

Option 2
You have to read the data push it to a map or set and then print the map.
If you can use C++

Option 3
You have to write a adata structure which will store uniqe values.


Raghu

[gpraghuram]

If you have to use only C then write a hash list to store the values and before storing check whether the element exists and then store it.
First start writing the code and if u face issues i can help you out with the problem.
I cant write the code for you

Raghu

[shariquehabib]

Hi Rahgu,

I have written this code:

::Full code removed, please read Posting Guidelines::

in that code, how can i avoid duplicate values? i m not aware abt hash list and i have checked with my team mate....i can use only simple file hadeling.

please help me on this...

--
Sharique

If you have to use only C then write a hash list to store the values and before storing check whether the element exists and then store it.
First start writing the code and if u face issues i can help you out with the problem.
I cant write the code for you

Raghu

[shariquehabib]

can any one help me on this?

[shariquehabib]

Hi Rahgu,

I have written this code:

::Full code removed, please read Posting Guidelines::

in that code, how can i avoid duplicate values? i m not aware abt hash list and i have checked with my team mate....i can use only simple file hadeling.

please help me on this...

--
Sharique

If you have to use only C then write a hash list to store the values and before storing check whether the element exists and then store it.
First start writing the code and if u face issues i can help you out with the problem.
I cant write the code for you

Raghu

[gpraghuram]

This is OK.
But withoput using a data structure you cant get the sorted vales from a file.
Check whether u can use an array....

Raghu

[shariquehabib]

Hi Raghu,

But can we avoid duplicates values ( when we are reading from file )??
after reading values from file, we can put in array or in stuct.

----
Sharique

This is OK.
But withoput using a data structure you cant get the sorted vales from a file.
Check whether u can use an array....

Raghu

[gpraghuram]

It is not possible to avoid duplicate values while reading.


Raghu