Opening and Defining FILE in C Programming

Opening and Defining FILE in C Programming

1. Before storing data onto the secondary storage , firstly we must specify following things -

• File name
• Data Structure
• Perpose / Mode
• Very first task in File handling is to open file

File name :

1. File name consists of two fields
2. First field is name field and second field is of extension field
3. Extension field is optional

1. Data structure of file is defined as FILE in the library of standered I/O functions
2. In short we have to declare the pointer variable of type FILE

Mode of FILE opening :

1. Depending upon the operation , select the mode eg. Reading,Writing,appending etc

Syntax of Declaring FILE pointer

FILE *fp;

Syntax of Opening file hello.txt

fp = fopen ("filename","mode");

Live Example :

#include<stdio.h>

void main()
{
 FILE *fp;
 char ch;
 fp = fopen("INPUT.txt","r") // Open file in Read mode

   while(1)
   {
   ch = fgetc(fp); // Read a Character
      if(ch == EOF ) // Check for End of File
         break ;

   printf("%c",ch);
   }
 fclose(fp); // Close File after Reading
}

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