Home » C programs » stdio.h header file functions

ftell() function in C language with Example

Here, we are going to learn about the ftell() function of library header stdio.h in C language with its syntax, example.
Submitted by Souvik Saha, on January 24, 2019

ftell() function in C

Prototype:

    long int ftell(FILE *filename);

Parameters:

    FILE *filename

Return type: long int

Use of function:

The ftell() function returns the current value of the file indicator pointer for the specified stream. In case of binary stream it returns the position in terms of bytes from the beginning. The prototype of the function ftell() is:

    long int ftell(FILE *filename);

When an error is occurred, it returns -1.

ftell() example in C

#include <stdio.h>
#include <stdlib.h>

int main(){
	//Initialize the file pointer
	FILE *f;
	//Take a array of characters 
	char ch[100];
	//Create the file for write operation
	f=fopen("includehelp.txt","w");
	printf("Enter five strings\n");
	for(int i=0;i<4;i++){
		//take the strings from the users
		scanf("%[^\n]",&ch);
		//write back to the file
		fputs(ch,f);
		//every time take a new line for the new entry string 
		//except for last entry.Otherwise print the last line twice
		fputs("\n",f);
		//clear the stdin stream buffer
		fflush(stdin);
	}
	//take the strings from the users
	scanf("%[^\n]",&ch);
	fputs(ch,f);
	//close the file after write operation is over
	fclose(f);
	//open a file
	f=fopen("includehelp.txt","r");
	printf("\n...............print the strings..............\n");
	while(!feof(f)){
		//takes the first 100 character in the character array 
		fgets(ch,100,f);
		//and print the strings
		printf("%s",ch);
	}
	rewind(f);
	printf("\n...............print the position after print a strings ..............\n");
	fgets(ch,100,f);
	printf("%s",ch);
	//print the current location
	printf("the file indicator position is - %d\n",ftell(f));

	//close the file
	fclose(f);

	return 0;
}

Output

ftell example in c






Comments and Discussions

Ad: Are you a blogger? Join our Blogging forum.
Learn PCB Designing: PCB DESIGNING TUTORIAL




Languages: » C » C++ » C++ STL » Java » Data Structure » C#.Net » Android » Kotlin » SQL
Web Technologies: » PHP » Python » JavaScript » CSS » Ajax » Node.js » Web programming/HTML
Solved programs: » C » C++ » DS » Java » C#
Aptitude que. & ans.: » C » C++ » Java » DBMS
Interview que. & ans.: » C » Embedded C » Java » SEO » HR
CS Subjects: » CS Basics » O.S. » Networks » DBMS » Embedded Systems » Cloud Computing » Machine learning » CS Organizations » Linux » DOS
More: » Articles » Puzzles » News/Updates

© https://www.includehelp.com some rights reserved.