Optimal Page Replacement Algorithm

#include<stdio.h>
#include<conio.h>
#define max 100
#define min 10

int ref[max],count,frame[min],n;

void input()
{
 int temp;
 do
 {
  clrscr();
  printf("\n\n\tEnter the number of page frames : ");
  scanf("%d",&n);
 }while(n>min || n <= 0);
 count = 0;
 printf("\n\n\tEnter the reference string (-1 for end) : ");
 scanf("%d",&temp);
 while(temp != -1 && count <= max)
 {
  ref[count++]=temp;
  scanf("%d",&temp);
 }
}

int find_pos(int nm)
{
 int ps,l,big=nm;
 for(int k=0;k<n;k++)
 {
  l = nm+1;
  while(ref[l] != frame[k] && l < count)
    l++;
  if(l>big)
  {
   big = l;
   ps = k;
  }
 }
return ps;
}

void OPT()
{
 int i,j,fault=0;
 for(i=0;i<n;i++)
  frame[i] = -1;
 int ind,pos=0;
 printf("\n\nPage       Page Status          Page Fault      Frame Status\n");
 printf("-------------------------------------------------------------------------------");
 for(i=0;i<count;i++)
 {
  ind = 0;
  printf("\n %d\t",ref[i]);
  for(j=0;j<n;j++)
  {
   if(frame[j] == -1)
   {
    ind = 1;
    pos = j;
    break;
   }
   if(frame[j] == ref[i])
   {
   printf("Already Inserted\t   No\t\t");
   ind = 2;
   break;
   }
  }
  if(ind != 2)
  {
   printf("Inserting in Frame\t   Yes\t\t");
   if(ind == 0)
    pos = find_pos(i);
   frame[pos] = ref[i];
   fault ++;
  }
  for(j=0;j<n;j++)
  {
   if(frame[j] == -1)
    printf(" -");
   else
    printf(" %d",frame[j]);
  }
 }
 printf("\n\n\n\n\tEnd to inserting the reference string.");
 printf("\n\n\tTotal page fault is %d.",fault);
}


void main()
{
input();
OPT();
getch();
}