Shortest Seek Time First (SSTF) in C -

i'm trying implement shortest seek time first (sstf) algorithm in linux command line. commandline read track values following line:

./disksed 53 98 183 37 122 14 124 65 67 

and print following report:

sstf: start:53 65:12 67:2 37:30 14:23 98:84 122:24 124:2 183:59 total:236 

am on right track @ all? i'm not getting correct values, , don't know how proceed. below code far. appreciated.

#include <stdio.h> #include <stdlib.h>  int main(int argc, char **argv) {  const int array_size = 9;  int sstd[array_size];  int total2 = 0;  int temp;   printf("\nsstf: start:");  printf("%s", argv[1]);  printf(" ");   (int = 1; < 9; i++)  {   if (strtol(argv[i + 1], null, 10) - strtol(argv[i], null, 10) < 0)    total2 += (abs(strtol(argv[i + 1], null, 10) - strtol(argv[i], null, 10)));   else    total2 += (strtol(argv[i + 1], null, 10) - strtol(argv[i], null, 10));    temp = strtol(argv[i + 1], null, 10);   argv[i + 1] = argv[i + 2];   argv[i + 2] = (char)temp;   sstd[i] = strtol(argv[i + 1], null, 10);    printf("%d", sstd[i]);   printf(":");   //print difference?   printf(" ");  }   printf("total:");  printf("%d", total2);  printf("\n");   return 0; }