clook.c

#include<stdio.h>
#include<stdlib.h>
int main() 
{
int RQ[100], i, j, n, TotalHeadMoment = 0, initial, size, move, index;
printf("Enter the number of requests: ");
scanf("%d", &n);
printf("Enter the request sequence: ");
for(i = 0; i < n; i++) {
scanf("%d", &RQ[i]);
}
printf("Enter the initial head position: ");
scanf("%d", &initial);
printf("Enter the total disk size: ");
scanf("%d", &size);
printf("Enter the head movement direction 1 for high, 0 for low: ");
scanf("%d", &move);
for(i = 0; i < n; i++)
{
for(j = 0; j < n - i - 1; j++)
{
if(RQ[j] > RQ[j+1])
{
int 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(move == 1)
{
for(i = index; i < n; i++)
{
TotalHeadMoment += abs(RQ[i] - initial);
initial = RQ[i];
}

//change
/*TotalHeadMoment += abs(size -  RQ[i-1]-1);
TotalHeadMoment += abs(size - 1-0);
initial =0;*/
for(i =0;i < index ;  i++)
{
TotalHeadMoment += abs(RQ[i] - initial);
initial = RQ[i];
}
}
else
{
for(i = index - 1; i >= 0; i--) 
{
TotalHeadMoment += abs(RQ[i] - initial);
initial = RQ[i];
}
//change
/*
TotalHeadMoment += abs( RQ[i+1]-0);
TotalHeadMoment += abs( size-1-0);
initial = size-1;*/
for(i = n-1; i >=index; i--) 
{
TotalHeadMoment += abs(RQ[i] - initial);
initial = RQ[i];
}
}
printf("Total head movement is: %d\n", TotalHeadMoment);
return 0;
}