Single Level Directory :

The single-level directory is the simplest directory structure. In it, all files are contained in the same directory which makes it easy to support and understand. A single level directory has a significant limitation, however, when the number of files increases or when the system has more than one user.

Advantages: 

• Since it is a single directory, so its implementation is very easy.

• If the files are smaller in size, searching will become faster.

• The operations like file creation, searching, deletion, updating are very easy in such a directory structure.

Disadvantages:

• There may chance of name collision because two files can have the same name.

• Searching will become time taking if the directory is large.

• This can not group the same type of files together.

Algorithm :

Step 1:Start

Step 2: Initialize values gd=DETECT,gm,count,i,j,mid,cir_x;

            Initialize character array fname[10][20];

Step 3: Initialize graph function as

             Initgraph(& gd, &gm," c:/tc/bgi");

             Clear device();

Step 4:set back ground color with setbkcolor();

Step 5:read number of files in variable count.

Step 6:if check i<count

Step 7: for i=0 & i<count

            i increment;

            Cleardevice();

            setbkcolor(GREEN);

            read file name;

            setfillstyle(1,MAGENTA);

Step 8: mid=640/count;

            cir_x=mid/3;

            bar3d(270,100,370,150,0,0);

            settextstyle(2,0,4);

            settextstyle(1,1);

            outtextxy(320,125,"rootdirectory");

            setcolor(BLUE);

            i++;

Step 9:for j=0&&j<=i&&cir_x+=mid

           j increment;

           line(320,150,cir_x,250);

           fillellipse(cir_x,250,30,30);

           outtextxy(cir_x,250,fname[i]);

Step 10: End

Program:

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

   int nf=0,i=0,j=0,ch;

   char mdname[10],fname[10][10],name[10];

   clrscr();

   printf("Enter the directory name:");

   scanf("%s",mdname);

   printf("Enter the number of files:");

   scanf("%d",&nf);

   do

   {

       printf("Enter file name to be created:");

       scanf("%s",name);

       for(i=0;i<nf;i++)

       {

           if(!strcmp(name,fname[i]))

           break;

        }

        if(i==nf)

        

       strcpy(fname[j++],name);

       nf++;

       }

       else

       printf("There is already %s\n",name);

       printf("Do you want to enter another file(yes - 1 or no - 0):");

       scanf("%d",&ch);

    }

   while(ch==1);

   printf("Directory name is:%s\n",mdname);

   printf("Files names are:");

   for(i=0;i<j;i++)

   printf("\n%s",fname[i]);

   getch();

}

Output :

Enter the directory name:sss

Enter the number of files:3

Enter file name to be created:aaa

Do you want to enter another file(yes - 1 or no - 0):1

Enter file name to be created:bbb

Do you want to enter another file(yes - 1 or no - 0):1

Enter file name to be created:ccc

Do you want to enter another file(yes - 1 or no - 0):0

Directory name is:sss

Files names are:

aaa

bbb

ccc