C Program to implement Shortest Seek Time First (SSTF) scheduling algorithm.

/* ================================================================================
 *  * *
 *  * *       Filename:  sstf.c
 *  * *        Created:  Tuesday 24 March 2015
 *  * *       Compiler:  gcc
 *  * *         Author:  Manoj Kumar Patra,manojpatra.sit@gmail.com
 *  * *   Organization:  SCIS,University of Hyderabad
 *  * *
 *  ===============================================================================*/

#include<stdio.h>
#include<stdlib.h>
void main()
{
int pos,size,diff = 1000,loc,i,j;
printf("========================================================");
printf("\nEnter the current head position:\n");
scanf("%d",&pos);
printf("\nEnter the number of DISK position:\n");
scanf("%d",&size);
int req[size];
printf("========================================================");
printf("\nEnter the location position to schedule:\n");
for(i=0;i<size;i++)
scanf("%d",&req[i]);
printf("========================================================");
printf("\nSSTF requests served in the order as follows :\n");
for(i=0;i<size;i++)
{
for(j=0;j<size;j++)
{
if(req[j] == -1)
continue;
else
{
if(abs(pos - req[j]) <= diff)
{
diff = abs(pos - req[j]);
loc = j;
}
}
}
diff = 1000;
printf("%d ",req[loc]);
pos = req[loc];
req[loc] = -1;
}
printf("\n========================================================");
printf("\n");
}