PROGRAM 9a):

AIM: Write a C Program to implement Sequential File Allocation method.

#include<stdio.h>

void main()

{

 int n,i,j,b[20],sb[20],t[20],x,c[20][20];

printf("Enter no.of files:");

 scanf("%d",&n);

 for(i=0;i<n;i++)

 {

          printf("Enter no. of blocks occupied by file%d:",i+1);

          scanf("%d",&b[i]);

          printf("Enter the starting block of file%d:",i+1);

          scanf("%d",&sb[i]);

          t[i]=sb[i];

          for(j=0;j<b[i];j++)

                   c[i][j]=sb[i]++;

          }

 printf("Filename\tStart block\tlength\n");

 for(i=0;i<n;i++)

          printf("%d\t        %d \t           %d\n",i+1,t[i],b[i]);

}

OUTPUT:

PROGRAM 9b):

AIM: Write a C Program to implement Indexed File Allocation method.

#include<stdio.h>

#include<conio.h>

main()

{

 int n,m[20],i,j,sb[20],s[20],b[20][20],x;

 clrscr();

 printf("Enter no. of files:");

 scanf("%d",&n);

 for(i=0;i<n;i++)

 {       printf("Enter starting block and size of file%d:",i+1);

          scanf("%d%d",&sb[i],&s[i]);

          printf("Enter blocks occupied by file%d:",i+1);

          scanf("%d",&m[i]);

          printf("enter blocks of file%d:",i+1);

          for(j=0;j<m[i];j++)

                   scanf("%d",&b[i][j]);

 } printf("\nFile\t index\tlength\n");

 for(i=0;i<n;i++)

 {

          printf("%d\t%d\t%d\n",i+1,sb[i],m[i]);

 }printf("\nEnter file name:");

 scanf("%d",&x);

 printf("file name is:%d\n",x);

 i=x-1;

 printf("Index is:%d",sb[i]);

 printf("Block occupied are:");

 for(j=0;j<m[i];j++)

          printf("%3d",b[i][j]);

 getch();

}

OUTPUT:

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

Program 9c):

Aim: Write a C Program to implement Linked File Allocation method.

#include<stdio.h>

#include<conio.h>

struct file

{

 char fname[10];

 int start,size,block[10];

}f[10];

main()

{

 int i,j,n;

 clrscr();

 printf("Enter no. of files:");

 scanf("%d",&n);

 for(i=0;i<n;i++)

 {

 printf("Enter file name:");

 scanf("%s",&f[i].fname);

 printf("Enter starting block:");

 scanf("%d",&f[i].start);

 f[i].block[0]=f[i].start;

 printf("Enter no.of blocks:");

 scanf("%d",&f[i].size);

 printf("Enter block numbers:");

 for(j=1;j<=f[i].size;j++)

 {

          scanf("%d",&f[i].block[j]);

 }

 }

 printf("File\tstart\tsize\tblock\n");

 for(i=0;i<n;i++)

 {

          printf("%s\t%d\t%d\t",f[i].fname,f[i].start,f[i].size);

          for(j=1;j<=f[i].size-1;j++)

                   printf("%d--->",f[i].block[j]);

          printf("%d",f[i].block[j]);

          printf("\n");

 }

 getch();

}