File Management

Dear Learner,

You will get interesting file management program on this page. We create a File for permanent storage of data. C language provides many functions that help us to perform various file operations. Some of the file management functions are given below:

Function Name	Description
fopen()	To create a new file or for opening existing file
fclose()	To close a file
fgetc()	To read a character from a file
fputc()	To write a character to a file
fscanf()	Reads data from a file
fprintf()	Writes data to a file

We use a structure pointer of file type as shown below in C language:

  FILE *fp;

General Syntax to open a file is as under:

  *fp = FILE *fopen(const char *filename, const char *mode);

Where, filename is the name of the file to be opened and mode specifies the purpose of opening the file. The important modes to operate a file are as under:

Mode	Description
r	opens a file for reading
w	opens or create a text file for writing
a	opens a text file for appending content
r+	opens a text file in both reading and writing mode
w+	opens a text file in both reading and writing mode
a+	opens a text file in both reading and writing mode

* * * * *

C Programming File Management Programs

Execute following C programs to learn more file management related functionalities.

• Program to read one line from a file.
• Program to write a word in text file.
• Program to copy content of one file to other.
• Program to read file line by line.
• Program to append data to text file.
• Program to count total vowels in given file.
• Writing a student data into a file using a structure

Sample C File Management Programs

C Program to read one character from a test.txt file.

Note: Your source file and test.txt file must be in a same folder.

#include<stdio.h>

int main(){

 FILE *fp;

 char ch;

 //code to open file for reading

 fp=fopen("test.txt","r");

 

 if(fp==NULL){

     printf("File error");

     exit(0);

 }

 //code to read a character

 ch = fgetc(fp);

  

 printf("%c",ch);

 fclose(fp);

 

 return 0;

}

* * *

C Program to read and print a test.txt file.

#include<stdio.h>

int main(){

 FILE *fp;

 char ch;

 fp=fopen("test.txt","r");

 

 if(fp==NULL){

printf("File error");

exit(0);

 }

 

 ch = fgetc(fp);

 while(ch != EOF){

printf("%c",ch);  

ch=fgetc(fp);

 }

 fclose(fp);

 

 return 0;

}