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Question: What is file pointer and its working method?

Answer: 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..



Category Pointers in C Interview Questions & Answers - Exam Mode / Learning Mode
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Question: What is file pointer and its working method?
Answer:

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..

Source: CoolInterview.com

Answered by: kishore reddy | Date: 1/17/2008 | 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; Source: CoolInterview.com

Answered by: Milind Kotibhaskar | Date: 1/17/2008 | 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. Source: CoolInterview.com

Answered by: SYED AMIDUL ISLAM | Date: 1/18/2008 | 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); Source: CoolInterview.com

Answered by: Syed Baseer Ahmed | Date: 1/21/2008 | 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. Source: CoolInterview.com

Answered by: mohit kumar | Date: 2/6/2008 | 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;

}
} Source: CoolInterview.com

Answered by: Andrew Gecse | Date: 4/9/2008 | Contact Andrew Gecse Contact Andrew Gecse


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