C File Input/Output ~ C Programming

C File Input/Ouput

File is not the new concept. File is a more flexible approach than the previous data entry approach. Files are the mega data structure in information processing. Storage of information and its retrieval are the vital components of system design and information system. By using files data can be stored on the disks and can be read whenever you want without destroying the date. A file is place on the disk where a group of related data is stored permanently. By using files we can sense the data. Files establish a permanent links between inputs and ouputs as data can be stored and retrieved. A computer programmber or data entry operator always prefer to enter data in the files instead of storing the data temporary in the main memory using the direct keyboard facility.

Definition
Types of Files
Files Operations
Input/Ouput statements used in file handling
A Program Write data into File and Read data from File :
Write a Program How many Words in a File :
Copy One File to another File :

Definition

A file is a collection of related data structure pertaining to a single entity. A file having payroll data processes the information of pay elements and not about the personal and educational information of an employee. So we can say file has mainly two basic elements: information and a single entity.

Types of Files

There are two mainly types of Files used in C Programming. These are below:

Files Operations

The processing of files has number of operation according to the user's requirement and the problem definition. But some of the commonly used file operations are as follows:

Naming a file

Opening a file

Reading data from a file

Writing data to a file or creation of data file

Closing a file

Updating a file

String Input/Ouput (Standard I/O)

Formatted Input/Ouput (Standard I/O)

Record (Block) Input/Ouput (Standard I/O)

A Program Write data into File and Read data from File :

#include<stdio.h>
#include<conio.h>
void main()
{
  FILE *p;
  char ch;

  printf("Enter the Lines");
  p = fopen("Student.txt","w");

  while((ch=getchar()!=EOF)
  {
    putc(ch,p);
  }
  fclose(p);

  printf("After the Inputting");

  p = fopen("Student.txt","r");

  while((ch=getc(p))!EOF)
  {
    printf("%c",ch);
  }
  fclose(p);
  getch();
}

Write a Program How many Words in a File :

#include<stdio.h>
#include<conio.h>
void main()
{
  FILE *p;
  char ch;
  int len = 1;
  clrscr();
  printf("Enter the Lines");
  p = fopen("Student.txt","w");

  while((ch=getchar()!=EOF)
  {
    putc(ch,p);
  }
  fclose(p);

  printf("After the Inputting");

  p = fopen("Student.txt","r");

  while((ch=getc(p))!EOF)
  {
    if(ch=="")
    {
      len ++;
    }
  }
  printf("Length of Words : %d",len);   fclose(p);
  getch();
}

Copy One File to another File :

#include<stdio.h>
#include<conio.h>
void main()
{
  FILE *p,*p2;
  char ch;
  clrscr();
  printf("Enter the Lines");
  p = fopen("Student.txt","w");

  while((ch=getchar()!=EOF)
  {
    putc(ch,p);
  }
  fclose(p);

  p = fopen("Student.txt","r");
  p2 = fopen("Teacher.txt","w");

  while((ch=getc(p))!EOF)
  {
    putc(ch,p2)
  }
  fclose(p);
  fclose(p2);
  }
  p = fopen =("Student.txt","r");
  while((ch=getc(p))!EOF)
  {
    printf("%c",ch);
  }
  fclose(p);
  p2 = fopen =("Teacher.txt","r");
  while((ch=getc(p2))!EOF)
  {
    printf("%c",ch)
  }
  fclose(p2);
  getch();
}