Solved

can i do this without using an array

Posted on 2004-09-20
8
333 Views
Last Modified: 2010-04-01

#include <iostream>

using namespace std;

      int main() {
   
unsigned char character[4];
cout << "Please enter four ASCII characters: " ;
cin >> character;
   
int letter = 0 ;
letter = letter | ((int)character[0] << 24);
letter = letter | ((int)character[1] << 16);
letter = letter | ((int)character[2] << 8 ) ;
letter = letter | ((int)character[3]);

cout << " The value as Hex " << hex << letter;
 
cout << " The letters in reverse order:";

unsigned char numone, numtwo, numthree, numfour;
numone   = (unsigned char)(letter >> 24 );
numtwo   = (unsigned char)(letter >> 16 );
numthree = (unsigned char)(letter >> 8  );
numfour  = (unsigned char)(letter);
   
cout << numfour << "," << numthree << "," << numtwo << "," << numone ;
   
      return 0 ;
}
0
Comment
Question by:tedschnieders
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 12104583
Yes, you can:

#include <iostream>
#include <string>

using namespace std;

int main() {
   
string character;
cout << "Please enter four ASCII characters: " ;
getline(cin, character;);
   
char* pszCnvEnd = NULL;
int letter = 0 ;

letter = (int) strtol ( character.c_str(), &pcCnvEnd, 16);

//...
0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 12104802
> unsigned char character[4];
> cout << "Please enter four ASCII characters: " ;
> cin >> character;

This code won't work anyway because you need to reserve one extra character space for ending null-character. Must be:
unsigned char character[5];

jkr's code has a litle bug:
getline(cin, character;);
must be:
getline(cin, character);

There is not significative difference in using char[5] and string, last one is an array too (but encapsulated).
0
 
LVL 86

Expert Comment

by:jkr
ID: 12104873
>>jkr's code has a litle bug:
>>getline(cin, character;);
>>must be:
>>getline(cin, character);

Thanks for pointing that out :o)

I should also add that

#include <stdlib.h>

is necessary and the 'strtol()' line should actually read


letter = (int) strtol ( character.c_str(), &pszCnvEnd, 16);
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 39

Expert Comment

by:itsmeandnobodyelse
ID: 12105165
Or that:

#include <iostream>

using namespace std;

int main()
{
    unsigned char characterF[4];
    unsigned char characterR[4];
    cout << "Please enter four ASCII characters: " << endl;

    for (int i = 0; i < 4; i++)
    {  
       cout << i << "-->";
       cin >> characterF[i];
       characterR[3-i] = characterF[i];
    }
    unsigned int letterR = *((unsigned int*)characterR);
   
    cout << " The value as Hex " << hex << letterR ;
    cout << " The letters in reverse order:";
    cout << characterF[0] << "," << characterF[1] << "," << characterF[2] << "," << characterF[3] ;
   
    return 0 ;
}

(tested)

Regards, Alex
0
 
LVL 3

Accepted Solution

by:
Kashra earned 500 total points
ID: 12106263
I think the following should work, without using the array, but I don't know why you wouldn't want to do so?

#include <iostream>

using namespace std;

int main() {

unsigned char character;
cout << "Please enter four ASCII characters: ";
character = cin.get();
   
int letter = 0 ;
letter = letter | ((int)character << 24);
character = cin.get();
letter = letter | ((int)character << 16);
character = cin.get();
letter = letter | ((int)character << 8 ) ;
character = cin.get();
letter = letter | ((int)character);

cout << " The value as Hex " << hex << letter;
 
cout << " The letters in reverse order:";

unsigned char numone, numtwo, numthree, numfour;
numone   = (unsigned char)(letter >> 24 );
numtwo   = (unsigned char)(letter >> 16 );
numthree = (unsigned char)(letter >> 8  );
numfour  = (unsigned char)(letter);
   
cout << numfour << "," << numthree << "," << numtwo << "," << numone ;
   
     return 0 ;
}
0
 
LVL 86

Expert Comment

by:jkr
ID: 12112788
That cannot work:

unsigned char character;
cout << "Please enter four ASCII characters: ";
character = cin.get();

How would 4 characters fit in one unsigned char?
0
 
LVL 39

Expert Comment

by:itsmeandnobodyelse
ID: 12113665
>>>> How would 4 characters fit in one unsigned char?

Simply by using the same character 4 times:

int letter = 0 ;
letter = letter | ((int)character << 24);
character = cin.get();
letter = letter | ((int)character << 16);
character = cin.get();
letter = letter | ((int)character << 8 ) ;
character = cin.get();
letter = letter | ((int)character);

Clever guy got all points for nothing.

Regards, Alex
0
 
LVL 3

Expert Comment

by:Kashra
ID: 12114372
Sorry guys, didn't mean to steal any points, just suggested a trivial answer. :)
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

696 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question