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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;} }
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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; }
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Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Introduction to computer science. OpenStax CNX. Jul 29, 2009 Download for free at http://cnx.org/content/col10776/1.1
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