LFU ALGORITHM
#include<stdio.h>
int n;
main()
{
int seq[30],fr[5],pos[5],find,flag,max,i,j,m,k,t,s,pf=0;
int count=1,p=0;
float pfr;
clrscr();
printf("enter max limit of the sequence:");
scanf("%d",&max);
printf("enter the sequence:");
for(i=0;i<max;i++)
scanf("%d",&seq[i]);
printf("enter the no of frames:");
scanf("%d",&n);
fr[0]=seq[0];
pf++;
printf("%d\t",fr[0]);
i=1;
while(count<n)
{
flag=1;
p++;
for(j=0;j<i;j++)
{
if(seq[i]==seq[j])
flag=0;
}
if(flag!=0)
{
fr[count]=seq[i];
printf("%d\t",fr[count] );
count++;
pf++;
}
i++;
}
printf("\n");
for(i=p;i<max;i++)
{
flag=1;
for(j=0;j<n;j++)
{
if(seq[i]==fr[j])
flag=0;
}
if(flag!=0)
{
for(j=0;j<n;j++)
{
m=fr[j];
for(k=i;k<max;k++)
{
if(seq[k]==m)
{
pos[j]=k;
break;
}
else
pos[j]=-1;
}
}
for(k=0;k<n;k++)
{
if(pos[k]==-1)
flag=0;
}
if(flag!=0)
s=findmax(pos);
if(flag==0)
{
for(k=0;k<n;k++)
{
if(pos[k]==-1)
{
s=k;
break;
}
}
}
pf++;
fr[s]=seq[i];
for(k=0;k<n;k++)
printf("%d\t",fr[k]);
printf("\n");
}
}
pfr=(float)pf/(float)max;
printf("\n theno of page faults are:%d",pf);
printf("\n page fault rate:%f",pfr);
getch();
}
int findmax(int a[])
{
int max,i,k=0;
max=a[0];
for(i=0;i<n;i++)
{
if(max<a[i])
{
max=a[i];
k=i;
}
}
return k;
}
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