C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast

Operators

What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement

Looping

What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop

Functions

What is Function C User Defined Functions C Recursion C Passing Parameters

Scope

Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register

Array

What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings

String

What is String C String Functions

Pointer

What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer

Structure

What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def

Union

What is Union

Files

What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

C Interview Sets All Star Patterns All Number Patterns All Alphabet Patterns All Series Patterns
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Other File Handling Functions

C provides some file functions to test whether the pointer is at the end of file, to return the pointer to the beginning of the file, to rename a file and to delete a file.

  • fseek()
  • feof()
  • ftell()
  • rewind()

fseek() - Files Functions

The fseek() function is used to positioning the file pointer in a file. We need to pass three arguments while calling fseek() function. They are file pointer, integer value to reposition a file pointer to forward or backward direction and current position of file pointer.

C Program - fseek()

fseek.c
#include <stdio.h>
int main()
{
char ch[100];
FILE *fptr;     //File pointer declaration
fptr = fopen("info.txt", "w+ ");     //the function fopen opens the text file
fputs("This is fseek", fptr);
fseek(fptr, 5, 0);
fgets(ch, 50, fptr);
printf("\nAfter file seek :\n ");
printf("%s", ch);
fclose(fptr);     //the function closes the opened file
return 0;
}
  • After file seek :
  • is fseek

feof() - Files Functions

The feof function is used to find whether the file pointer reaches the end of a file or not. It returns non-zero value when the pointer reaches the end of file.

C Program - feof()

feof.c
#include <stdio.h>
int main()
{
FILE *fptr;     //File pointer declaration
fptr = fopen("info.txt", "r+ ");     //the function fopen opens the text file
fputs("This is feof", fptr);
rewind(fptr);
while(1)
{
ch = fgetc(fptr);
if(feof(fptr))
{
printf("\nEnd of file reached ");
break;
}
printf("%c ", ch);
}
fclose(fptr);     //the function close a opened file
return 0;
}
  • This is feof End of file reached

Note:

The feof function used to detect whether the end of a file is reached or not. It return zero when end of a file is reached by the file pointer.

ftell() - Files Functions

The ftell() function is used to return a current position of a file pointer.

C Program - ftell()

ftell.c
#include <stdio.h>
int main()
{
FILE *fptr;     //File pointer declaration
fptr = fopen("info.txt", "r+ ");     //the function fopen opens the text file
fputs("This function returns the current position of pointer", fptr);
rewind(fptr);
printf("%d ", ftell(fptr));
fseek(fptr, 5, 1);
printf("\n%d ", ftell(fptr));
return 0;
}
  • 0
  • 5

rewind() - Files Functions

The rewind function is used to return a file pointer to the beginning of a file.

C Program - rewind()

rewind.c
#include <stdio.h>
int main()
{
FILE *fptr;     //File pointer declaration
char ch;
fptr = fopen("info.txt", "r+ ");     //the function fopen opens the text file
fputs("This is rewind", fptr);
rewind(fptr);
while(1)
{
ch = fgetc(fptr);
if(feof(fptr))
{
printf("\nEnd of file reached ");
break;
}
printf("%c ", ch);
}
fclose(fptr);     //the function closes the opened file
return 0;
}
  • This is rewind
  • End of file reached

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