CoolInterview.com - World's Largest Collection of Interview Questions & Answers, FAQs, queries, sample papers, exam papers, dumps, what, why, how, where, when questions
Interview Success Kit - Get Success in Job Interviews Interview Success Kit - 30,000 Interview Que. & Ans.
Covers 30,000+ Interview Questions asked in actual MNC Interviews - all with model answers.
Get Your Dream Job Now - www.vyoms.com
Sponsored Links
Interview Questions
Our Services

INTERVIEW QUESTIONS C POINTERS IN C DETAILS
Question :
What is file pointer and its working method?

Posted by: mohan on 11/27/2012

Contact mohan Contact mohan
Category Pointers in C Interview Questions
Rating (3.1) By 39 users
Added on 11/27/2012
Views 2342
Rate it!
Answers:

when a pointer is pointing to the address of a file than it is called as a file pointer.
for example:
FILE *fp;
here in above statement we are declaring a file pointer.
there are many modes of opening a file.they are read ,write,append ..
they are as follows..
fp=fopen("filename.c",'r');
above statement is opening a file in read mode..



Posted by: kishore reddy

Contact kishore reddy Contact kishore reddy

C communicates with files using a new data type called a file pointer. This type is defined within stdio.h, and written as FILE *. A file pointer called output_file is declared in a statement like


FILE *output_file;



Posted by: Milind Kotibhaskar

Contact Milind Kotibhaskar Contact Milind Kotibhaskar

Basically a file pointer is capable to store address of a file which is created by fopen function.Using this pointer we can do operations(read,write,modify) on the file.



Posted by: SYED AMIDUL ISLAM

Contact SYED AMIDUL ISLAM Contact SYED AMIDUL ISLAM

File pointer is the pointer which holds the address of the file which is opened either in read or write or append or binary modes(r,w,a,r+,w+,a+,b).

FILE *fp;

This is the declaration of the file pointer.

Opening of the file is done by any one of the following.

fp = fopen("filename.txt","r"); or
fp = fopen("filename.TXT","w"); or
fp = fopen("filename.DAT","a"); or
fp = fopen("filename","r+"); or
fp = fopen("filename.txt","w+"); or
fp = fopen("filename.txt","a+"); or
fp = fopen("filename.txt","b");

When fopen opens the file successfully, fp holds the address of the first character in the file.

We can read or write into the file using the functions like fread() or fwrite().

After all operations, we have to close the file using fclose(fp);



Posted by: Syed Baseer Ahmed

Contact Syed Baseer Ahmed Contact Syed Baseer Ahmed

File pointer is a pointer which is used in file handling through file pointer we can open the file in write mode and read mode and also closed the file through file pointer.



Posted by: mohit kumar

Contact mohit kumar Contact mohit kumar

A special data type for handling files is defined in the stdio.h header file.

It is called the file pointer and has the syntax FILE*.

File pointers are used to open,read,write and close files.


FILE *file_ptr;
file_ptr=fopen("data.txt","w");

It is advisable to test the file pointer against NULL value if we get back NULL the actual operation /with the file/ has failed.

#include <stdio.h>

int main()
{

FILE *file_ptr;
file_ptr=fopen("data.txt","w");

if (file_ptr!=NULL)
{
printf("file created
");
fclose (file_ptr);
return 0;
}
else
{ printf("unable to create file
");
return 1;

}
}



Posted by: Andrew Gecse

Contact Andrew Gecse Contact Andrew Gecse

If you have the better answer, then send it to us. We will display your answer after the approval.
Rules to Post Answers in CoolInterview.com:-

  • There should not be any Spelling Mistakes.
  • There should not be any Gramatical Errors.
  • Answers must not contain any bad words.
  • Answers should not be the repeat of same answer, already approved.
  • Answer should be complete in itself.
  • Name :*
    Email Id :*
    Answer :*
    Verification Code Code Image - Please contact webmaster if you have problems seeing this image code Not readable? Load New Code
    Process Verification Enter the above shown code: *
    Inform me about updated answers to this question

    Related Questions
    View Answer
    How I can add two numbers in c language without using Arithmetic operators?
    View Answer
    What is pointer?
    View Answer
    What are the disadvantages of using Pointers.
    View Answer
    How to operate pointers in any pragram & how to develop our logic while implementing pointer
    View Answer
    Difference between arrays and pointers?

    View Answer
    What is the difference between NULL and NUL?


    View Answer
    What is a null pointer?


    View Answer
    What is a const pointer?
    View Answer
    What is pointer?

    View Answer
    What do you mean by normalisation of pointers

    View Answer
    Following declarations are same
    const char *s;
    char const *s;


    View Answer
    In the following code, what is p2?

    typedef int* ptr

    ptr p1, p2;




    View Answer
    In the following code, what is p2?

    typedef int* ptr

    ptr p1, p2;




    View Answer
    What is far pointer?

    View Answer
    Between a long pointer and a char pointer , which one consumes more memory? explain

    View Answer
    How reliable are floating-point comparisons?
    View Answer
    What is indirection?
    View Answer
    How many levels of pointers can you have?
    View Answer
    What is a null pointer?
    View Answer
    What is a void pointer?
    View Answer

    Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here Vyoms.com - Best Freshers & Experienced Jobs Website.

    View ALL Pointers in C Interview Questions & Answers

    User Options
    Latest 20 Questions
    What are the characteristics of services?
    What are services?
    What are refunds?
    What do you mean by product complement?
    What are the Components of Financial Market?
    What is rebate?
    What are the functions of Financial Market?
    What are contests?
    What are sweepstakes?
    State the methods of sales promotion.
    What do you mean by sales promotion?
    What are the moral qualities of a good salesman?
    what are the social qualities of a good salesman?
    What are the mental and psychological qualities of a good salesman.
    What are the physical qualities of a good salesman?
    State the difference between advertising and promotion.
    State the features of personal selling.
    What are the essentials of advertisement copy?
    What is advertisement copy?
    What are the merits and demerits of advertising?



    Fresher Jobs | Experienced Jobs | Government Jobs | Walkin Jobs | Company Profiles | Interview Questions | Placement Papers | Companies In India | Consultants In India | Colleges In India | Exams In India | Latest Results | Notifications In India | Call Centers In India | Training Institutes In India | Job Communities In India | Courses In India | Jobs by Keyskills | Jobs by Functional Areas

    Testing Articles | Testing Books | Testing Certifications | Testing FAQs | Testing Downloads | Testing Interview Questions | Testing Jobs | Testing Training Institutes

    Gate Articles | Gate Books | Gate Colleges | Gate Downloads | Gate Faqs | Gate Jobs | Gate News | Gate Sample Papers | Gate Training Institutes

    MBA Articles | MBA Books | MBA Case Studies | MBA Business Schools | MBA Current Affairs | MBA Downloads | MBA Events | MBA Notifications | MBA FAQs | MBA Jobs
    MBA Job Consultants | MBA News | MBA Results | MBA Courses | MBA Sample Papers | MBA Interview Questions | MBA Training Institutes

    GRE Articles | GRE Books | GRE Colleges | GRE Downloads | GRE Events | GRE FAQs | GRE News | GRE Training Institutes | GRE Sample Papers

    IAS Articles | IAS Books | IAS Current Affairs | IAS Downloads | IAS Events | IAS FAQs | IAS News | IAS Notifications | IAS UPSC Jobs | IAS Previous Question Papers
    IAS Results | IAS Sample Papers | IAS Interview Questions | IAS Training Institutes | IAS Toppers Interview

    SAP Articles | SAP Books | SAP Certifications | SAP Companies | SAP Study Materials | SAP Events | SAP FAQs | SAP Jobs | SAP Job Consultants
    SAP Links | SAP News | SAP Sample Papers | SAP Interview Questions | SAP Training Institutes |




    Copyright ©2003-2016 CoolInterview.com, All Rights Reserved.
    Privacy Policy | Terms and Conditions



    Cache = 0 Seconds