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Linked allocation.c
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Linked allocation.c
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#include<stdio.h>
#include<stdlib.h>
int count=1,a[100];
struct file
{
int name;
int s;
int numblocks;
int link[100];
}f[200];
int create(int n)
{
int num,count1=0;
printf("enter file name u want to create\n");
scanf("%d",&f[count].name);
//printf("enter the start block\n");
//scanf("%d",&f[count].s);
printf("enter number of blocks prescent in file\n");
scanf("%d",&f[count].numblocks);
num=f[count].numblocks;
//printf("num:%d\n",num);
int flag=0,reel=0;
//a[f[count].s]=f[count].name;
//f[count].link[count1++]=f[count].s;
for(int ii=0;ii<n&&reel<num;ii++)
{
flag=0;
int p = rand()%n;
if(a[p]==-1)
{
reel++;
flag=1;
a[p]=f[count].name;
f[count].link[count1++]=p;
}
}
printf("\n");
count++;
printf("disc is:\n");
for(int ik=0;ik<n;ik++)
{
printf("%d ",a[ik]);
}
printf("\n");
}
int del(int n)
{
int namer,c,flag=0;
printf("enter the file u want to delete\n");
scanf("%d",&namer);
for(int j=1;j<=count;j++)
{
if(f[j].name==namer)
{
c=j;
flag=1;
}
}
int num=f[c].numblocks;
//printf("num:%d\n",num);
if(flag==0)
{
printf("file does not exist\n");
}
for(int i=0;i<num;i++)
{
printf("hello\n");
a[f[c].link[i]]=-1;
}
f[c].name=-1;
printf("\n");
printf("disc is:\n");
for(int ik=0;ik<n;ik++)
{
printf("%d ",a[ik]);
}
printf("\n");
}
int traverse()
{
printf("File_name\t length of blocks\t blocks allocated\n");
for(int i=1;i<count;i++)
{
if(f[i].name != -1)
{
printf("%d\t ",f[i].name);
printf("%d\t ",f[i].numblocks);
for(int j=0;j<f[i].numblocks;j++)
{
printf("%d ",f[i].link[j]);
}
printf("\n");
}
}
}
int main()
{
int n,size,t=0,tab,choice,num;
printf("enter total number of blocks\n");
scanf("%d",&n);
printf("enter block size\n");
scanf("%d",&size);
for(int i=0;i<n;i++)
{
a[i]=-1;
}
printf("\n");
do
{
printf("enter your choice\n");
printf("1.create 2.del 3.traverse\n");
scanf("%d",&choice);
switch(choice)
{
case 1 : printf("file is being created\n");
create(n);
printf("file created successfully\n");
break;
case 2 : printf ("file is being deleted\n");
del(n);
printf("file deleted successfully\n");
break;
case 3 : printf("file is being traversed\n");
traverse();
break;
}
printf("do u want to continue press 1 if u wish to continue\n");
scanf("%d",&t);
}while(t==1);
}