//C Programe for  INDEXED  FILE ALLOCATION  //

#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 in C to show sequential file allocation

#include<stdio.h>

#include<conio.h>

main()

{

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

 clrscr();

 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]);

 printf("Enter file name:");

 scanf("%d",&x);

 printf("File name is:%d",x);

 printf("length is:%d",b[x-1]);

 printf("blocks occupied:");

 for(i=0;i<b[x-1];i++)

          printf("%4d",c[x-1][i]);

 getch();

}

OUTPUT