LRU Page Replacement.c

#include <stdio.h>
int arrmin(int[], int);
main()
{
int i,j,len,rs[50],frame[10],nf,k,avail,count=0;
int access[10], freq=0, dm;
printf("Length of Reference string : ");
scanf("%d", &len);
printf("Enter reference string :\n");
for(i=1; i<=len; i++)
scanf("%d", &rs[i]);
printf("Enter no. of frames : ");
scanf("%d", &nf);
for(i=0; i<nf; i++)
frame[i] = -1;
j = 0;
printf("\nRef. str Page frames");
for(i=1; i<=len; i++)
{
printf("\n%4d\t", rs[i]);
avail = 0;
for(k=0; k<nf; k++)
{
if(frame[k] == rs[i])
{
avail = 1;
access[k] = ++freq;
break;
}
}
if(avail == 0)
{
dm = 0;
for(k=0; k<nf; k++)
{
if(frame[k] == -1)
dm = 1;
break;
}
if(dm == 1)
{
frame[k] = rs[i];
access[k] = ++freq;
count++;
}
else
{
j = arrmin(access, nf);
frame[j] = rs[i];
access[j] = ++freq;
count++;
}
for(k=0; k<nf; k++)
printf("%4d", frame[k]);
}
}
printf("\n\nTotal no. of page faults : %d\n", count);
}
int arrmin(int a[], int n)
{
int i, min = a[0];
for(i=1; i<n; i++)
if (min > a[i])
min = a[i];
for(i=0; i<n; i++)
if (min == a[i])
return i;
}