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LRU.txt
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LRU.txt
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import java.util.*;
public class LRU {
int p[], n, fr[], m, fs[], index, k, l, flag1 = 0, flag2 = 0, pf = 0, framesize = 3, i, j;
Scanner src = new Scanner(System.in);
void read() {
System.out.println("Enter Total No. of Pages :");
n = src.nextInt();
p = new int[n];
System.out.println("Enter the Pages : ");
for (int i = 0; i < n; i++)
p[i] = src.nextInt();
System.out.println("Enter the Number of frames : ");
m = src.nextInt();
fr = new int[m];
fs = new int[m];
}
void display() {
System.out.println("\n");
for (i = 0; i < m; i++) {
if (fr[i] == -1)
System.out.println("[ ]");
else
System.out.println("[" + fr[i] + "]");
}
}
void lru() {
for (i = 0; i < m; i++) {
fr[i] = -1;
}
for (j = 0; j < n; j++) {
flag1 = 0;
flag2 = 0;
for (i = 0; i < m; i++) {
if (fr[i] == p[j]) {
flag1 = 1;
flag2 = 1;
break;
}
}
if (flag1 == 0) {
for (i = 0; i < m; i++) {
if (fr[i] == -1) {
fr[i] = p[j];
flag2 = 1;
break;
}
}
}
if (flag2 == 0) {
for (i = 0; i < 3; i++)
fs[i] = 0;3
for (k = j - 1, l = 1; l <= framesize - 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++;
}
System.out.print("Page : " + p[j]);
display();
}
System.out.println("\n Number of page fault:" + pf);
}
public static void main(String args[]) {
LRU a = new LRU();
a.read();
a.lru();
a.display();
}
}