IMPLEMENTATION OF RANDOM ACCESS FILE

AIM

            To write a C program to implement random access of files.

ALGORITHM

Step-1: Start the program

Step-2: Open the file RANDOM in write mode and get the characters.

Step-3: If it is the End of File then print the number of characters entered.

Step-4: Close the file and open it in read mode.

Step-5: Find the position of each character using fseek and print it.

Step-6: Stop the program

PROGRAM

#inlcude<stdio.h>

#include<conio.h>

void main()

{

FILE *fp;

long n;

char c;

fp=fopen(“RANDOM”,”w”),;

while((c=getchar())!=EOF)

putc(c,fp);

printf(“no. of characters entered = %ld \n”,ftell(fp));

fclose(fp);

fp=fopen(“RANDOM”,”r”);

n=OL;

while(feof(fp)==0)

{

fseek(fp,n,0); /* position to ()n+1)th character */

printf(“Position of %c is %ld \n”, getc(fp),ftell(fp));

n=n+5L;

}

putchar(‘\n’);

fseek(fp,-1L,2);

do

{

putchar(getc(fp));

}

while(!fseek(fp,-2L,1));

fclose(fp);

}

OUTPUT

ABCDEFGHIJKLMNOPQRSTUVWXYZ

No. of characters entered =26

Position of A is 0

Position of F is 5

Position of K is 10

Position of P is 15

Position of U is 20

Position of Z is 25

  

RESULT: Thus a C program is written to implement random access of files is executed.