<< Chapter < Page Chapter >> Page >

Feof() function

int feof(FILE *fp);

This function check if End-of-File indicator associated with fp is set

Return value: A non-zero value is returned in the case that the End-of-File indicator associated with the fp is set. Otherwise, a zero value is returned.

Create a text file called fscanf.txt in Notepad with this content:

0 1 2 3 4 5 6 7 8 910 11 12 13

Remember how scanf stops reading input when it encounters a space, line break or tab character? fscanf is just the same. So if all goes to plan, this example should open the file, read all the numbers and print them out:

#include<stdio.h>int main() { FILE *fp;int numbers[30];/* make sure it is large enough to hold all the data! */ int i,j;fp = fopen("fscanf.txt", "r"); if(fp==NULL) {printf("Error: can't open file.\n"); return 1;} else {printf("File opened successfully.\n"); i = 0 ;while(!feof(fp)) { /* loop through and store the numbers into the array */fscanf(fp, "%d",&numbers[i]);i++; }printf("Number of numbers read: %d\n\n", i);printf("The numbers are:\n"); for(j=0 ; j<i ; j++) { /* now print them out one by one */ printf("%d\n", numbers[j]); }fclose(fp); return 0;} }
Got questions? Get instant answers now!

Fflush() function

Same as scanf() , before using fscanf() to read the character or string from the file, we need use fflush() .The fflush() function prototype is as follows.

int fflush(FILE *fp)

If the given file that specified by fp was open for writing and the last I/O operation was an output operation, any unwritten data in the output buffer is written to the file. If the file was open for reading, the behavior depends on the specific implementation. In some implementations this causes the input buffer to be cleared. If the argument is a null pointer, all open files are flushed. The files remains open after this call. When a file is closed, either because of a call to fclose or because the program terminates, all the buffers associated with it are automatically flushed.

Return Value: A zero value indicates success. If an error occurs, EOF is returned and the error indicator is set (see feof).

Fgetc() function

The fgetc() function prototype is as follows.

int fgetc(FILE *fp);

This function returns the character currently pointed by the internal file position indicator of the specified fp. The internal file position indicator is then advanced by one character to point to the next character.

Return value: The character read is returned as an int value. If the EOF is reached or a reading error happens, the function returns EOF and the corresponding error or eof indicator is set. You can use either ferror or feof to determine whether an error happened or the EOF was reached.

Write the program reads an existing file called myfile.txt character by character and uses the n variable to count how many dollar characters ($) does the file contain.

#include<stdio.h>int main () {FILE * fp; int c;int n = 0; fp=fopen ("myfile.txt","r");if (fp==NULL) printf("Error opening file"); else{ do {c = fgetc (fp); if (c == '$') n++;} while (c != EOF); fclose (fp);printf ("File contains %d$.\n",n); }return 0; }
Got questions? Get instant answers now!

Questions & Answers

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Introduction to computer science. OpenStax CNX. Jul 29, 2009 Download for free at http://cnx.org/content/col10776/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Introduction to computer science' conversation and receive update notifications?