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#include<stdio.h> #include<conio.h>
int i,j,nof,nor,flag=0,ref[50],frm[50],pf=0,victim=-1; int recent[10],lrucal[50],count=0;
int lruvictim(); void main()
{
clrscr();
printf("\n\t\t\t LRU PAGE REPLACEMENT ALGORITHM"); printf("\n Enter no.of Frames	");
scanf("%d",&nof);
printf(" Enter no.of reference string.."); scanf("%d",&nor);
printf("\n Enter reference string.."); for(i=0;i<nor;i++) scanf("%d",&ref[i]);
printf("\n\n\t\t LRU PAGE REPLACEMENT ALGORITHM "); printf("\n\t      The      given       reference       string:"); printf("\n	");
for(i=0;i<nor;i++) printf("%4d",ref[i]); for(i=1;i<=nof;i++)
{
frm[i]=-1; lrucal[i]=0;
}
for(i=0;i<10;i++) recent[i]=0; printf("\n"); for(i=0;i<nor;i++)
{
flag=0;
printf("\n\t Reference NO %d->\t",ref[i]);

for(j=0;j<nof;j++)
{
if(frm[j]==ref[i])
{
flag=1; break;
}
}
if(flag==0)
{
count++; if(count<=nof) victim++;
else victim=lruvictim(); pf++; frm[victim]=ref[i]; for(j=0;j<nof;j++) printf("%4d",frm[j]);
}
recent[ref[i]]=i;
}
printf("\n\n\t No.of page faults...%d",pf); getch();
}
int lruvictim()
{
int i,j,temp1,temp2; for(i=0;i<nof;i++)
{
temp1=frm[i]; lrucal[i]=recent[temp1];
}
temp2=lrucal[0]; for(j=1;j<nof;j++)
{
if(temp2>lrucal[j])

temp2=lrucal[j];
}
for(i=0;i<nof;i++) if(ref[temp2]==frm[i])
return i;
return 0;
}