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CIRCULAR_SCAN.c
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CIRCULAR_SCAN.c
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#include <stdio.h>
#include <stdlib.h>
int main()
{
int n,i,j,rq[100],intial,thm=0,size,move,index,temp,ind;
printf("Enter no of requests: ");
scanf("%d",&n);
printf("Enter Request Sequence: \n");
for(i=0;i<n;i++)
scanf("%d",&rq[i]);
printf("Enter intial head position: ");
scanf("%d",&intial);
printf("Enter size of the disk: ");
scanf("%d",&size);
printf("Enter head movement direction 1->High 2->Low: ");
scanf("%d",&move);
for(i=0;i<n-1;i++)
{
ind=i;
for(j=i+1;j<n;j++)
{
if(rq[j]<rq[ind])
ind=j;
}
temp=rq[i];
rq[i]=rq[ind];
rq[ind]=temp;
}
for(i=0;i<n;i++)
{
if(rq[i]>intial)
{
index=i;
break;
}
}
if(move==1)
{
for(i=index;i<n;i++)
{
thm=thm+abs(rq[i]-intial);
intial=rq[i];
}
thm=thm+abs(size-rq[i-1]-1);
thm=thm+abs(size-1-0);
intial=0;
for(i=0;i<index;i++)
{
thm=thm+abs(rq[i]-intial);
intial=rq[i];
}
}
else
{
for(i=index-1;i>=0;i--)
{
thm=thm+abs(rq[i]-intial);
intial=rq[i];
}
thm=thm+abs(rq[i+1]-0);
thm=thm+abs(0-size-1);
intial=size-1;
for(i=size-1;i>=index;i--)
{
thm=thm+abs(rq[i]-intial);
intial=rq[i];
}
}
printf("Total Head Movement: %d",thm);
}