SSTF

#include<stdio.h> #include<stdlib.h> int main()

{

int RQ[100],i,n,TotalHeadMoment=0,initial,count=0;
printf("Enter the number of Requests\n");
scanf("%d",&n);
printf("Enter the Requests sequence\n");
for(i=0;i<n;i++) scanf("%d",&RQ[i]);
printf("Enter initial head position\n");
scanf("%d",&initial); printf("%d-
",initial);
/* loop will execute until all process is completed*/

while(count!=n)

{
int min=1000,d,index;
for(i=0;i<n;i++)
{
d=abs(RQ[i]-initial);
if(min>d)
{
min=d;
index=i;
}

}
TotalHeadMoment=TotalHeadMoment+min;
initial=RQ[index];
printf("------->%d",RQ[index]);
// 1000 is for max
// you can use any number
RQ[index]=1000;
count++;
}

printf("\nTotal head movement is %d",TotalHeadMoment);
return 0;}