File Handling in C

tutorial and example
tutorial and example

File Handling is used to open, read, write, search and close file.  C files I/O functions handles data on secondary storage device.

File handling function:

There are varioushandling functions in c.

Function Operation
fopen() It is used to create a file.
fclose() It is used to create close an existing file.
getc() It is used to read a character from a file.
putc() It is used to write a character in file.
fprintf() It is used to write set of data in file.
fscanf() It is used to read set of data from file.
getw() It is used to read an integer from a file
putw() It is used to write an integer in file.

C fopen() function

The fopen() function is used to open a file.The given syntax of file opening is.

Syntax

Let us consider an example

Here is filePath declare a variable as a pointer to the data type FILE.

There are different type of modes that help us to access the file in the fopen() function.

Mode Description
r It is used to open a text file in read mode.
W It is used to open a text file in write mode.
a It is used to open a text file in append mode.
r+ It is used open a text file in read and write mode.
w+ It is used open a text file in read and write mode.
a+ It is used open a text file in read and write mode.
rb It is used open a binary file in read mode.
wb It is used open a binary file in write mode.
ab It is used open a binary file in append mode.
rb+ It is used open a binary file in read and write mode.
wb+ It is used open a binary file in read and write mode.
ab+ It is used open a binary file in read and write mode.

C fclose() function:

The fclose() function is used to close a file .

Following is the syntax of fclose() function

Syntax:

Example

  • The above example will call the < filename> name.
  • The wis used to open for writing, and if the file does not exist then new file will be created.
  • The fprintf function writes text on the file.
  • The fclosefunction closed the file and reassesses the memory stream.

C getc() function

In C language, getc() function is  library function that is used to read a character from a file.

Synatx:

Example

Cfputc() function

In C language, fputc() function is used to write a character to the file.

Syntax:

C fprintf()function:

The C printf() function is used  to write the characters into file.

Syntax:

Example

C fscanf()function:

The C fscanf() is used to read the characters from file. It reads a word from the file and returns EOF at the end of file.

Syntax:

Example

C fputs() function

C fputs() function is used to write a line of characters into file  and return outputs string to a stream.

Syntax:

Example

C fgets() function

The fgets() functionis used to read a line of character from file and get string from a stream.

Syntax:

char* fgets(char *s, int n, FILE *stream) 

Example

#include<stdio.h>

int main(){

FILE *fp;

char text[200];

fp=fopen(“myfilee.txt”,”r”);

printf(“%s”,fgets(text,100,fp));

fclose(fp);

return 0;

}

Output

Hello You are Programmer