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7
//FIFO
#include<stdio.h>
void main()
{
int i, j, k, f, pf=0, count=0, rs[25], m[10], n;
printf("\n Enter the length of reference string -- ");
scanf("%d",&n);
printf("\n Enter the reference string -- ");
for(i=0;i<n;i++)
scanf("%d",&rs[i]);
printf("\n Enter no. of frames -- ");
scanf("%d",&f);
for(i=0;i<f;i++)
m[i]=-1;
printf("\n The Page Replacement Process is -- \n");
for(i=0;i<n;i++)
{
for(k=0;k<f;k++)
{
if(m[k]==rs[i])
break;
}
if(k==f)
{
m[count++]=rs[i];
pf++;
}
for(j=0;j<f;j++)
printf("\t%d",m[j]);
if(k==f)
printf("\tPF No. %d",pf);
printf("\n");
if(count==f)
count=0;
}
printf("\n The number of Page Faults using FIFO are %d",pf);
}

//LRU
#include<stdio.h>
int main()
{
int i, j , k, min, rs[25], m[10], count[10], flag[25], n, f, pf=0, next=1;
printf("Enter the length of reference string -- ");
scanf("%d",&n);
printf("Enter the reference string -- ");
for(i=0;i<n;i++)
{
scanf("%d",&rs[i]);
flag[i]=0;
}
printf("Enter the number of frames -- ");
scanf("%d",&f);
for(i=0;i<f;i++)
{
count[i]=0;
m[i]=-1;
}
printf("\nThe Page Replacement process is -- \n");
for(i=0;i<n;i++)
{
for(j=0;j<f;j++)
{
if(m[j]==rs[i])
{
flag[i]=1;
count[j]=next;
next++;
}
}
if(flag[i]==0)
{
if(i<f)
{
m[i]=rs[i];
count[i]=next;
next++;
}
else
{
min=0;
for(j=1;j<f;j++)
if(count[min] > count[j])
min=j;
m[min]=rs[i];
count[min]=next;
next++;
}
pf++;
}
for(j=0;j<f;j++)
printf("%d\t", m[j]);
if(flag[i]==0)
printf("PF No. -- %d" , pf);
printf("\n");
}
printf("\nThe number of page faults using LRU are %d",pf);
}

8
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_FILES 10
#define MAX_FILENAME_LENGTH 10
char directoryName[MAX_FILENAME_LENGTH];
char filenames[MAX_FILES][MAX_FILENAME_LENGTH];
int fileCount = 0;
void createFile() {
if (fileCount < MAX_FILES) {
char filename[MAX_FILENAME_LENGTH];
printf("Enter the name of the file: ");
scanf("%s", filename);
strcpy(filenames[fileCount], filename);
fileCount++;
printf("File %s created.\n", filename);
} else {
printf("Directory is full, cannot create more files.\n");
}
}
void deleteFile() {
if (fileCount == 0) {
printf("Directory is empty, nothing to delete.\n");
return;
}
char filename[MAX_FILENAME_LENGTH];
printf("Enter the name of the file to delete: ");
scanf("%s", filename);
int found = 0;
for (int i = 0; i < fileCount; i++) {
if (strcmp(filename, filenames[i]) == 0) {
found = 1;
printf("File %s is deleted.\n", filename);
strcpy(filenames[i], filenames[fileCount - 1]);
fileCount--;
break;
}
}
if (!found) {
printf("File %s not found.\n", filename);
}
}
void displayFiles() {
if (fileCount == 0) {
printf("Directory is empty.\n");
} else {
printf("Files in the directory %s:\n", directoryName);
for (int i = 0; i < fileCount; i++) {
printf("\t%s\n", filenames[i]);
}
}
}
int main() {
printf("Enter the name of the directory: ");
scanf("%s", directoryName);
while (1) {
printf("\n1. Create File\t2. Delete File\t3. Search File\n4. Display Files\t5. Exit\nEnter your choice:");
int choice;
scanf("%d", &choice);
switch (choice) {
case 1:
createFile();
break;
case 2:
deleteFile();
break;
case 3:
printf("Enter the name of the file: ");
char searchFilename[MAX_FILENAME_LENGTH];
scanf("%s", searchFilename);
int found = 0;
for (int i = 0; i < fileCount; i++) {
if (strcmp(searchFilename, filenames[i]) == 0) {
found = 1;
printf("File %s is found.\n", searchFilename);
break;
}
}
if (!found) {
printf("File %s not found.\n", searchFilename);
}
break;
case 4:
displayFiles();
break;
case 5:
exit(0);
default:
printf("Invalid choice, please try again.\n");
}
}
return 0;
}

9
#include <stdio.h>
#include <stdlib.h>
int main(){
int f[50], p, i, st, len, j, c, k, a, fn=0;
for (i = 0; i < 50; i++)
f[i] = 0;
/* printf("Enter how many blocks already allocated: ");
scanf("%d", &p);
printf("Enter blocks already allocated: ");
for (i = 0; i < p; i++) {
scanf("%d", &a);
f[a] = 1;
}*/
x:
fn=fn+1;
printf("Enter index starting block and length: ");
scanf("%d%d", &st, &len);
k = len;
if (f[st] == 0)
{
for (j = st; j < (st + k); j++){
if (f[j] == 0)
{
f[j] = fn;
printf("%d ------ >%d\n", j, f[j]);
}
else{
printf("%d Block is already allocated \n", j);
k++;
}
}
}
else
printf("%d starting block is already allocated \n", st);
printf("Do you want to enter more file(Yes - 1/No - 0)");
scanf("%d", &c);
if (c == 1)
goto x;
else
exit(0);
return 0;
}
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