HeLp CeNtEr: November 2013

Friday, 29 November 2013

PROJECT EVALUATION SCHEDULE (CSE)

PROJECT EVALUATION SCHEDULE

(BOTH CS-A & CS-B)

Saturday, 23 November 2013

NOS SAMPLE QUESTIONS

S7 CSE EXTERNAL LAB EXAMINATION NOTICE

NOTE: SUBJECT CODES ARE WRONG... CONSIDER ONLY SUBJECT NAME... COME ACCORDING TO SUBJECT NAME ONLY...

if images below are not clear,,, u can see the pdf here:

LP LAB & NOS LAB

Bring Hall Ticket and Fair Record on the day of examination

Friday, 22 November 2013

To send palindrome back to parent process

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
int main(){
int pid,a,n,p[2],p2[2],i,len,j,k,flag,n2=0;
char buffr1[100][100],buffr2[100][100],buf[5];
printf("Enter the limit:- ");
scanf("%d",&n);
a = pipe(p);
if(a == -1)
{
fprintf(stderr, "Pipe Failed.\n");
return EXIT_FAILURE;
}
a = pipe(p2);
if(a == -1)
{
fprintf(stderr, "Pipe Failed.\n");
return EXIT_FAILURE;
}
pid = fork();
switch(pid)
{
case -1:perror("main: fork");
exit(1);
case 0: read(p[0],buffr2,sizeof(buffr2));
printf("In child process (ID: %d)\n", pid);
for(i=0;i<n;i++)
{
len=strlen(buffr2[i]);
flag=0;
for(j=0,k=len-1;j<len;j++,k--)
{
if(buffr2[i][j]!=buffr2[i][k])
{
flag=1;
break;
}
}
if(flag==0)
{
n2++;
strcpy(buffr1[n2],buffr2[i]);
}
}
buffr1[0][0]=n2;
write(p2[1],buffr1,sizeof(buffr1));
exit(1);
break;
default: printf("In parent process (ID: %d)\n", pid);
for(i=0;i<n;i++)
{
printf("Enter the string %d:- ",i+1);
scanf("%s",buffr1[i]);
}
write(p[1],buffr1,sizeof(buffr1));
waitpid(pid,NULL,0);
read(p2[0],buffr2,sizeof(buffr2));
printf("In parent process (ID: %d)\n", pid);
n=(int) buffr2[0][0];
for(i=1;i<=n;i++)
printf("Palindrome %d:- %s\n",i,buffr2[i]);
break;
}
close(p[0]);
close(p[1]);
close(p2[0]);
close(p2[1]);
return 0;
}

To send back prime numbers to parent process

#include <stdio.h> //for fprintf printf scanf stderr
#include <stdlib.h> //for exit
#include <unistd.h> //for pipe fork read write close
#include <math.h> //for sqrt
#include <sys/types.h> //for waitpid
#include <sys/wait.h> //for waitpid

int main(){
int pid,a,n,p[2],p1[2],i,j,buffr1[100],buffr2[100],flag,n2=0, check;
a = pipe(p);
if(a == -1)
{
fprintf(stderr, "Pipe Failed.\n");
return EXIT_FAILURE;
}
a=pipe(p1);
if(a == -1)
{
fprintf(stderr, "Pipe Failed.\n");
return EXIT_FAILURE;
}
pid = fork();
switch(pid)
{
case -1:perror("main: fork");
exit(1);
case 0: n=read(p[0],buffr2,sizeof(buffr2));
printf("In child process (ID: %d)\n", pid);
n=n/sizeof(int);
for(i=0;i<n;i++)
{
flag=0;
if(buffr2[i]<=1)
flag=1;
check = sqrt(buffr2[i]);
for(j=2;j<=check;j++)
{
if((buffr2[i]%j)==0)
{
flag=1;
break;
}
}
if(flag==0)
{
buffr1[n2]=buffr2[i];
n2++;
}
}
write(p1[1],buffr1,n2*sizeof(int));
exit(1);
break;
default: printf("In parent process (ID: %d)\n", pid);
printf("Enter the limit:- ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("Enter the element %d:- ",i+1);
scanf("%d",&buffr1[i]);
}
write(p[1],buffr1,n*sizeof(int));
waitpid(pid,NULL,0);
printf("In parent process (ID: %d)\n", pid);
n2=read(p1[0],buffr2,sizeof(buffr2));
n2=n2/sizeof(int);
for(i=0;i<n2;i++)
printf("Prime Number %d:- %d\n",i+1,buffr2[i]);
break;
}
close(p[0]);
close(p[1]);
close(p1[0]);
close(p1[1]);
return 0;
}

To send N strings from parent to child process

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main()
{
int pid,a,n,p[2],i;
char buffr1[100][100],buffr2[100][100];
printf("Enter the limit:- ");
scanf("%d",&n);
a = pipe(p);
if(a == -1)
{
fprintf(stderr, "Pipe Failed.\n");
return EXIT_FAILURE;
}
pid = fork();
switch(pid)
{
case -1:perror("main: fork");
exit(1);
case 0: read(p[0],buffr2,sizeof(buffr2));
printf("In child process (ID: %d)\n", pid);
for(i=0;i<n;i++)
printf("String %d:- %s\n",i+1,buffr2[i]);
exit(1);
break;
default: printf("In parent process (ID: %d)\n", pid);
for(i=0;i<n;i++)
{
printf("Enter the string %d:- ",i+1);
//gets(buffr1[i]);
//scanf ("%[^\n]%*c", buffr1[i]);
scanf("%s",buffr1[i]);
}
write(p[1],buffr1,sizeof(buffr1));
waitpid(pid,NULL,0);
break;
}
close(p[0]);
close(p[1]);
return 0;
}

To send N numbers from a parent process to child process and display them.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main()
{
int pid,a,n,p[2],i,buffr1[100],buffr2[100];
a = pipe(p);
if(a == -1)
{
fprintf(stderr, "Pipe Failed.\n");
return EXIT_FAILURE;
}
pid = fork();
switch(pid)
{
case -1:perror("main: fork");
exit(1);
case 0: n=read(p[0],buffr2,sizeof(buffr2));
printf("In child process (ID: %d)\n", pid);
n=n/sizeof(int);
for(i=0;i<n;i++)
printf("Number %d:- %d\n",i+1,buffr2[i]);
exit(1);
break;
default: printf("In parent process (ID: %d)\n", pid);
printf("Enter the limit:- ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("Enter the element %d:- ",i+1);
scanf("%d",&buffr1[i]);
}
write(p[1],buffr1,n*sizeof(int));
waitpid(pid,NULL,0);
break;
}
close(p[0]);
close(p[1]);
return 0;
}

REVERSE FILE CONTENT

#include <stdio.h>
#include <stdlib.h>

int main()
{
char ch, source_file[20], dest_file[20],temp[500];
int count = 0,i;
FILE *source, *dest;

printf("Enter name of file to read : ");
gets(source_file);

source = fopen(source_file, "r");

printf("Enter name of target file where you want to store reversed characters : ");
gets(dest_file);

dest = fopen(dest_file, "w");
int j=0;
while( ( ch = fgetc(source) ) != EOF )
{
count += 1;
temp[j] = ch;
j++;
}

i=count-1;
while(i>-1)
{
fputc(temp[i], dest);
i--;
}

printf("File copied successfully.\n");

fclose(source);
fclose(dest);

return 0;
}

DISPLAY FILE ATTRIBUTES

#include<sys/stat.h>

#include<pwd.h>

#include<time.h>

#include<stdio.h>

int main()

{

int s;

char source[30],flag='y';

struct stat filestat;

struct passwd *pwd;

printf("\nEnter the file name:- ");

gets(source);

s=stat(source,&filestat);

if(s!=-1)

{

printf("\nOwner id: %d",filestat.st_uid);

if((pwd = getpwuid(filestat.st_uid)) != NULL)

{

printf("\tname: %s", pwd->pw_name);

}

printf("\nFile Size: %ld bytes",filestat.st_size);

printf("\nFile Permission (Octal Notation): %o", filestat.st_mode);

printf("\nFile Permissions (Symbolic Notation): \t");

printf( (S_ISDIR(filestat.st_mode)) ? "d" : "-" );

printf( (filestat.st_mode & S_IRUSR) ? "r" : "-" );

printf( (filestat.st_mode & S_IWUSR) ? "w" : "-" );

printf( (filestat.st_mode & S_IXUSR) ? "x" : "-" );

printf( (filestat.st_mode & S_IRGRP) ? "r" : "-" );

printf( (filestat.st_mode & S_IWGRP) ? "w" : "-" );

printf( (filestat.st_mode & S_IXGRP) ? "x" : "-" );

printf( (filestat.st_mode & S_IROTH) ? "r" : "-" );

printf( (filestat.st_mode & S_IWOTH) ? "w" : "-" );

printf( (filestat.st_mode & S_IXOTH) ? "x" : "-" );

printf("\nDate of creation: %s",ctime(&filestat.st_ctime));

printf("Last Modified Date: %s",ctime(&filestat.st_mtime));

printf("\n");

}

else

printf("\nError!!!");

return 0;

}

REPLICATING DOS COPY COMMAND

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{

if(argc!=3)
{
printf("Not enough arguments... :P ");
exit(0);
}
char ch;
FILE *source, *dest;

source = fopen(argv[1], "r");

dest = fopen(argv[2], "w");

while( ( ch = fgetc(source) ) != EOF )
fputc(ch, dest);

printf("File copied successfully.\n");

fclose(source);
fclose(dest);

return 0;
}

TO RUN THE PROGRAM:
gcc program_name.c -o cpy
./cpy source_file_name dest_file_name

------------------------------------------------------------------------------------------------------------

#include<stdio.h>
#include<stdlib.h>
int main()
{
char command[100],source[100],destination[100];
int ret;
printf("\nEnter the source file name ");
gets(source);
printf("\nEnter the destination file name ");
gets(destination);
sprintf(command,"cp %s %s",source,destination);
ret=system(command);
if(ret==0)
printf("Successfully Copied from %s to %s\n",source,destination);
return 0;
}

TO RUN THE PROGRAM:
gcc program_name.c -o cpy
./cpy

Thursday, 21 November 2013

S7 CSE LAB SCHEDULE (EXTERNAL LAB EXAM)

Is there any difficulty in looking in picture, Download PDF here: LP LAB & NOS LAB

NOTE: Subject codes are incorrect... It won't be a problem for regular students... Supplementary students please re-check the schedule on 23rd evening. Thank-you.

Subject

HeLp CeNtEr