#include <stdio.h>

#define FILENAME "C:\\c\\cars\\sis1.dat"          /* input data file             */
#define MINIMUM 20                /* 's' inventory policy parameter */
#define MAXIMUM 80                /* 'S' inventory policy parameter */
#define sqr(x) ((x) * (x))

/* ======================== */
long GetDemand(FILE *fp)
/* ======================== */
{

long d;

fscanf(fp, "%ld\n", &d);
return (d);
}

/* ============== */
int main(void)
/* ============== */
{
FILE *fp;                            /* input data file       */
long index = 0;                   /* time interval index */
long inventory = MAXIMUM;             /* current inventory level */
long demand;                         /* amount of demand    */
long order;                            /* amount of order       */
struct {                               /* sum of ...          */
double setup;                      /* setup instances    */
double holding;                      /* inventory held (+) */
double shortage;                   /* inventory short (-) */
double order;                      /* orders             */
double demand;                      /* demands             */
} sum = { 0.0, 0.0, 0.0, 0.0, 0.0 };

fp = fopen(FILENAME, "r");
if (fp == NULL) {
fprintf(stderr, "Cannot open input file %s\n", FILENAME);
return (1);
}

while (!feof(fp)) {
index++;
if (inventory < MINIMUM) {          /* place an order       */
   order       = MAXIMUM - inventory;
   sum.setup++;
   sum.order += order;
}
else                               /* no order             */
   order       = 0;
inventory    += order;             /* there is no delivery lag */
demand       = GetDemand(fp);
sum.demand += demand;
if (inventory > demand)
   sum.holding += (inventory - 0.5 * demand);
else {
   sum.holding += sqr(inventory) / (2.0 * demand);
   sum.shortage += sqr(demand - inventory) / (2.0 * demand);
}
inventory    -= demand;
}

if (inventory < MAXIMUM) {             /* force the final inventory to */
order       = MAXIMUM - inventory; /* match the initial inventory */
sum.setup++;
sum.order    += order;
inventory    += order;
}

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