Prev Next

fgets() function in C:

fgets() function is a file handling function in C programming language which is used to read a file line by line. Please find below the description and syntax for above file handling function.

File operation

Declaration & Description

fgets()

Declaration: char *fgets(char *string, int n, FILE *fp)

fgets function is used to read a file line by line. In a C program, we use fgets function as below.

fgets (buffer, size, fp);
where

buffer – buffer to put the data in.

size – size of the buffer

fp – file pointer

Example program for fgets() function in C programming language:

This file handling C program illustrates how to read the contents of a file. Assume that, a file called “test.c” contains the following data “Hi, How are you?”. Let’s read this data using following C program using fgets() function.

/* Open, Read and close a file: reading string by string */

# include <stdio.h>
int main( )
{
         FILE *fp ;
         char data[50] ;
         printf( "Opening the file test.c in read mode" ) ;
         fp = fopen( "test.c", "r" ) ;
         if ( fp == NULL )
         {
                 printf( "Could not open file test.c" ) ;
                 return 1;
         }
         printf( "Reading the file test.c" ) ;
         while( fgets ( data, 50, fp ) != NULL )
         printf( "%s" , data ) ;
         printf("Closing the file test.c") ;
         fclose(fp) ;
         return 0;
}

/* Open, Read and close a file: reading string by string */

# include <stdio.h>

int main( )

{

FILE *fp ;

char data[50] ;

printf( "Opening the file test.c in read mode" ) ;

fp = fopen( "test.c", "r" ) ;

if ( fp == NULL )

{

printf( "Could not open file test.c" ) ;

return 1;

}

printf( "Reading the file test.c" ) ;

while( fgets ( data, 50, fp ) != NULL )

printf( "%s" , data ) ;

printf("Closing the file test.c") ;

fclose(fp) ;

return 0;

}

Output:

Opening the file test.c in read mode

Reading the file test.c

Hi, How are you?

Closing the file test.c

Other Inbuilt file handling functions in C programming language:

C programming language offers many other inbuilt functions for handling files. They are given below. Please click on each function name below to know more details, example programs, output for the respective file handling function.

File handling functions	Description
fopen ()	fopen () function creates a new file or opens an existing file.
fclose ()	fclose () function closes an opened file.
getw ()	getw () function reads an integer from file.
putw ()	putw () functions writes an integer to file.
fgetc ()	fgetc () function reads a character from file.
fputc ()	fputc () functions write a character to file.
gets ()	gets () function reads line from keyboard.
puts ()	puts () function writes line to o/p screen.
fgets ()	fgets () function reads string from a file, one line at a time.
fputs ()	fputs () function writes string to a file.
feof ()	feof () function finds end of file.
fgetchar ()	fgetchar () function reads a character from keyboard.
fprintf ()	fprintf () function writes formatted data to a file.
fscanf ()	fscanf () function reads formatted data from a file.
fputchar ()	fputchar () function writes a character onto the output screen from keyboard input.
fseek ()	fseek () function moves file pointer position to given location.
SEEK_SET	SEEK_SET moves file pointer position to the beginning of the file.
SEEK_CUR	SEEK_CUR moves file pointer position to given location.
SEEK_END	SEEK_END moves file pointer position to the end of file.
ftell ()	ftell () function gives current position of file pointer.
rewind ()	rewind () function moves file pointer position to the beginning of the file.
getc ()	getc () function reads character from file.
getch ()	getch () function reads character from keyboard.
getche ()	getche () function reads character from keyboard and echoes to o/p screen.
getchar ()	getchar () function reads character from keyboard.
putc ()	putc () function writes a character to file.
putchar ()	putchar () function writes a character to screen.
printf ()	printf () function writes formatted data to screen.
sprinf ()	sprinf () function writes formatted output to string.
scanf ()	scanf () function reads formatted data from keyboard.
sscanf ()	sscanf () function Reads formatted input from a string.
remove ()	remove () function deletes a file.
fflush ()	fflush () function flushes a file.

Prev Next

Like it? Please Spread the word!