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C program for LRU page replacement algorithm

Saturday, September 19th, 2009

OUTPUT :
2 -1 -1
2  3 -1
2  3 -1
2  3  1
2  5  1
2  5  1
2  5  4
2  5  4
3  5  4
3  5  2
3  5  2
3  5  2
no of page faults : 4

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#include<stdio.h>
#include<conio.h>
int fr[3];
void main()
{
void display();
int p[12]={2,3,2,1,5,2,4,5,3,2,5,2},i,j,fs[3];
int index,k,l,flag1=0,flag2=0,pf=0,frsize=3;
clrscr();
for(i=0;i<3;i++)
{
fr[i]=-1;
}
for(j=0;j<12;j++)
{
flag1=0,flag2=0;
for(i=0;i<3;i++)
{
if(fr[i]==p[j])
{
flag1=1;
flag2=1;
break;
}
}
if(flag1==0)
{
for(i=0;i<3;i++)
{
if(fr[i]==-1)
{
fr[i]=p[j];
flag2=1;
break;
}
}
}
if(flag2==0)
{
for(i=0;i<3;i++)
fs[i]=0;
for(k=j-1,l=1;l<=frsize-1;l++,k--)
{
for(i=0;i<3;i++)
{
if(fr[i]==p[k])
fs[i]=1;
}
}
for(i=0;i<3;i++)
{
if(fs[i]==0)
index=i;
}
fr[index]=p[j];
pf++;
}
display();
}
printf("\n no of page faults :%d",pf);
getch();
}
void display()
{
int i;
printf("\n");
for(i=0;i<3;i++)
printf("\t%d",fr[i]);
}

OUTPUT :
2 -1 -1
2  3 -1
2  3 -1
2  3  1
2  5  1
2  5  1
2  5  4
2  5  4
3  5  4
3  5  2
3  5  2
3  5  2
no of page faults : 4

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Author Name :
Ranjith

Total : 8 Comments

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8 Responses to C program for LRU page replacement algorithm

  1. student_from_politechnika
    June 4th, 2010 at 4:45 pm

    good job :)
    if you want I send you my project in cpp.

  2. mery
    June 19th, 2010 at 8:55 pm

    good job

    can u send me your projuct… I think that it can help me

    thainks a lot

  3. usha
    November 7th, 2010 at 7:37 pm

    Hi
    This pgm sounds good. If u have page replacement algorithm project can u
    u mail to the above e mail address

  4. paul
    February 18th, 2011 at 8:40 pm

    why only 4 page faults? i think there are 7 page faults…

  5. Akansha
    April 22nd, 2011 at 4:20 pm

    paul u r correct..there r 7 page faults..he hasnt included the initial page faults while inserting the pages initially in d stack

  6. Hariswaroop
    May 8th, 2011 at 1:19 am

    this code has 6 page faults…

  7. shashank singh
    September 23rd, 2011 at 8:27 pm

    yup akansha that’s correct…………he hasn’t included d initial page faults

  8. bhagya
    October 23rd, 2011 at 8:28 am

    ya dis pogram is crct but page faults are 7 he did not include first 3

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