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scan.c
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scan.c
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#include<stdio.h>
#include<stdlib.h>
void main()
{
int n,i,j,RQ[50],initial,index,size,dir,temp,total=0;
printf("Enter number of request:");
scanf("%d",&n);
printf("Enter the request sequence:");
for(i=0;i<n;i++)
scanf("%d",&RQ[i]);
printf("Enter the initial head:");
scanf("%d",&initial);
printf("Enter the disk size:");
scanf("%d",&size);
printf("Enter the direction (high-1/low-0)");
scanf("%d",&dir);
for(i=0;i<n;i++)
{
for(j=0;j<n-i-1;j++)
{
if(RQ[j]>RQ[j+1])
{
temp=RQ[j];
RQ[j]=RQ[j+1];
RQ[j+1]=temp;
}
}
}
for(i=0;i<n;i++)
{
if(initial<RQ[i])
{
index=i;
break;
}
}
if(dir==1)
{
for(i=index;i<n;i++)
{
total+=abs(RQ[i]-initial);
initial=RQ[i];
}
total+=abs(RQ[i-1]-size-1);
initial=size-1;
for(i=index-1;i>=0;i--)
{
total+=abs(RQ[i]-initial);
initial=RQ[i];
}
}
else
{
for(i=index-1;i>=0;i--)
{
total+=abs(RQ[i]-initial);
initial=RQ[i];
}
total+=abs(RQ[i+1]-0);
initial=0;
for(i=index;i<n;i++)
{
total+=abs(RQ[i]-initial);
initial=RQ[i];
}
}
printf("Total head movement is %d",total);
}