Sunday, March 17, 2013

C++ program to convert decimal number into binary 



Program to convert decimal to binary in C++



/* 
program : Decimal to binary. 
description : to convert decimal number between 0 to 255 to binary  */
# include <iostream>
#include <math.h>
using namespace std ;
int main()
{
unsigned short int x=0,b=128 ,z=0,a=8 ;
cout<<"please enter the number between 0 and 255 \n";
cin >> x;
if (x>255)
cout<<" out of range ";
else
{
cout << x <<" converted to binary number :" ; 
 while (a!=0)
 {
  z=x&b ;
  if (z==128)
  cout << "1" ;
  else
  cout << "0";
  x=(x << 1);
  a-- ;
}
}
cout<<"\n";
system("pause");
return 0 ;
}





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By: Unknown On 5:11 AM
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C++ Program for Decimal to Hexadecimal Conversion

Convert decimal to hexadecimal (C++)



/* program : Decimal to hexadecimal. 
description : to convert decimal number between 0 to 255 to hexadecimal  */

#include <iostream>
using namespace std;

int main(void)
{
int mynum;
cout << "\nEnter a number: ";
cin >> mynum;
cout.unsetf(ios::dec);
cout.setf(ios::hex | ios::showbase);
cout << "In hex: " << mynum;
cout.unsetf(ios::hex);
cout.setf(ios::oct);
cout << "\nIn Octal: " << mynum;
cout.unsetf(ios::oct | ios::showbase);
cout.setf(ios::dec);
system("pause");
return 0;
}



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By: Unknown On 4:56 AM
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Saturday, March 16, 2013

How to connect two Client IP to the same mongodb using c++ Drivers


I am trying to make a client with mongo c++ drivers to connect to the database. I successfully tested the client for the localhost.The code I used for that is below.

Now I want to have the database and clients on different machines for example client on IP 10.1.2.56 and the mongodb on IP 10.1.2.57

I changes should I make in the code to achieve that. I tried to change the line

    c.connect("localhost"); //"192.168.58.1");

To


     c.connect("10.1.2.57"); //"192.168.58.1");

But that does not work
The error says "caught can't connect to server 10.1.2.57:27017 " I tried to ping the IP 10.1.2.57 and it give me the response also .


   #include <iostream>
    #include "mongo/client/dbclient.h"
    
    // g++ src/mongo/client/examples/tutorial.cpp -pthread -Isrc -Isrc/mongo
 -lmongoclient -lboost_thread-mt -lboost_system -lboost_filesystem -L[path to
 libmongoclient.a] -o tutorial
    //g++ tutorial.cpp -L[mongo directory] -L/opt/local/lib -lmongoclient 
-lboost_thread-mt -lboost_filesystem -lboost_system -I/opt/local/include 
 -o tutorial
    
    using namespace mongo;
    
    void printIfAge(DBClientConnection& c, int age) {
        auto_ptr<DBClientCursor> cursor = c.query("tutorial.persons", QUERY( "age" << age ).sort("name") );
        while( cursor->more() ) {
            BSONObj p = cursor->next();
            cout << p.getStringField("name") << endl;
        }
    }
    
    void run() {
        DBClientConnection c;
        c.connect("localhost"); //"192.168.58.1");
        cout << "connected ok" << endl;
        BSONObj p = BSON( "name" << "Joe" << "age" << 33 );
        c.insert("tutorial.persons", p);
        p = BSON( "name" << "Jane" << "age" << 40 );
        c.insert("tutorial.persons", p);
        p = BSON( "name" << "Abe" << "age" << 33 );
        c.insert("tutorial.persons", p);
        p = BSON( "name" << "Methuselah" << "age" << BSONNULL);
        c.insert("tutorial.persons", p);
        p = BSON( "name" << "Samantha" << "age" << 21 << "city" << "Los Angeles" << "state" << "CA" );
        c.insert("tutorial.persons", p);
    
        c.ensureIndex("tutorial.persons", fromjson("{age:1}"));
    
        cout << "count:" << c.count("tutorial.persons") << endl;
    
        auto_ptr<DBClientCursor> cursor = c.query("tutorial.persons", BSONObj());
        while( cursor->more() ) {
            cout << cursor->next().toString() << endl;
        }
    
        cout << "\nprintifage:\n";
        printIfAge(c, 33);
    }
    
    int main() {
        try {
            run();
        }
        catch( DBException &e ) {
            cout << "caught " << e.what() << endl;
        }
        return 0;
    }


I found the Answer of the above question

Earlier the mongod was running on the defined port and path on the Mongodb server side 
 
So I stoped the Mongodb by following command

    $ sudo stop mongodb

and once again started the server with the default defined path by the following command

    $ sudo mongod --dbpath /data/db --port 27017 

and then tried the above code in c++ and this time it connected to the remote server.
By: Unknown On 2:48 AM
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