FCFS disk scheduling

Program to implement FCFS disk scheduling algorithm

// Variable description: req[] - array for taking the request, move - to calculate the total head movement

#include<math.h>

#include<stdio.h>

int main()

{

    int i,n,req[50],mov=0,cp;

    printf("enter the current position\n");

    scanf("%d",&cp);

    printf("enter the number of requests\n");

    scanf("%d",&n);

    printf("enter the request order\n");

    for(i=0;i<n;i++)

    {

        scanf("%d",&req[i]);

    }

    mov=mov+abs(cp-req[0]); // abs is used to calculate the absolute value

    printf("%d -> %d",cp,req[0]);

    for(i=1;i<n;i++)

    {

        mov=mov+abs(req[i]-req[i-1]);

        printf(" -> %d",req[i]);

    }

    printf("\n");

    printf("total head movement = %d\n",mov);

}