LRU Page Replacement Program
#include<iostream>using namespace std;
int main()
{
int p[50],q[20],b[20],c2[20];
int c=0,k=0,c1,d,f,i,j,n,r,t;
cout<<"Enter no of pages:";
cin>>n;
cout<<"Enter the reference string:";
for(i=0;i<n;i++)
cin>>p[i];
cout<<"Enter no of frames:";
cin>>f;
q[k]=p[k];
cout<<"\n\t"<<q[k]<<endl;
c++;
k++;
for(i=1;i<n;i++)
{
c1=0;
for(j=0;j<f;j++)
{
if(p[i]!=q[j])
c1++;
}
if(c1==f)
{
c++;
if(k<f)
{
q[k]=p[i];
k++;
for(j=0;j<k;j++)
cout<<"\t"<<q[j];
cout<<endl;
}
else
{
for(r=0;r<f;r++)
{
c2[r]=0;
for(j=i-1;j<n;j--)
{
if(q[r]!=p[j])
c2[r]++;
else
break;
}
}
for(r=0;r<f;r++)
b[r]=c2[r];
for(r=0;r<f;r++)
{
for(j=r;j<f;j++)
{
if(b[r]<b[j])
{
t=b[r];
b[r]=b[j];
b[j]=t;
}
}
}
for(r=0;r<f;r++)
{
if(c2[r]==b[0])
q[r]=p[i];
cout<<"\t"<<q[r];
}
cout<<endl;
}
}
}
cout<<"\nThe no of page faults is "<<c;
return 0;
}
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