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need help on C-string

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Join Date: Dec 2005

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fidelljf

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need help on C-string

Dec 2nd, 2005

I'm working on a problem where the user inputs the first name, middle name and last name and should produce the output, last name, first name then midde initial.
example:

input: John Smith Doe

output: Doe, John S.

the program should also work even if the user does not put the middle name.
example:

input: John Doe
output: Doe, John

So far my program takes care only of the first example and I can't figure out on how to take care of the second example.
So far here is what I got.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;
 
 
int main()
{ using namespace std;
 
	string first_name, last_name;
	char middle_name[20];
 
	cout << "Enter your first name, middle name or initial and last name in that order\n";
    cin >> first_name >> middle_name >> last_name;
    cout << endl;
	cout << last_name << ", " << first_name << " " << middle_name[0] << "." << endl;
 
	return 0;
}
#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;


int main()
{ using namespace std;

	string first_name, last_name;
	char middle_name[20];

	cout << "Enter your first name, middle name or initial and last name in that order\n";
    cin >> first_name >> middle_name >> last_name;
    cout << endl;
	cout << last_name << ", " << first_name << " " << middle_name[0] << "." << endl;
	
	return 0;
}

Last edited by Dave Sinkula; Dec 2nd, 2005 at 12:06 am. Reason: Added [code][/code] tags.

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Join Date: Apr 2004

Posts: 4,361

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Dave Sinkula Dave Sinkula is offline

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long time no c

Re: need help on C-string

Dec 2nd, 2005

Do you know how to input a line of text and parse it?

"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand

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Join Date: Dec 2005

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fidelljf

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Re: need help on C-string

Dec 2nd, 2005

no I dont

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Join Date: Apr 2004

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Dave Sinkula Dave Sinkula is offline

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long time no c

Re: need help on C-string

Dec 2nd, 2005

Why a char array for the middle name when you are already using strings? If you can use vectors and stringstreams, the normal C++ way, I'd do something like this.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
using namespace std;
 
int main()
{
   string line;
   cout << "Enter your first name, middle name or initial and last name in that order\n";
   if ( getline(cin, line) )
   {
      vector<string> name;
      istringstream iss(line);
      while ( iss >> line )
      {
         name.push_back(line);
      }
      if ( name.size() > 2 )
      {
         cout << name[2] << ", " << name[0] << ' ' << name[1][0] << ".\n";
      }
      else
      {
         cout << name[1] << ", " << name[0] << "\n";
      }
   }
   return 0;
}
 
/* my output
Enter your first name, middle name or initial and last name in that order
John Quincy Public
Public, John Q.
*/
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
using namespace std;

int main()
{
   string line;
   cout << "Enter your first name, middle name or initial and last name in that order\n";
   if ( getline(cin, line) )
   {
      vector<string> name;
      istringstream iss(line);
      while ( iss >> line )
      {
         name.push_back(line);
      }
      if ( name.size() > 2 )
      {
         cout << name[2] << ", " << name[0] << ' ' << name[1][0] << ".\n";
      }
      else
      {
         cout << name[1] << ", " << name[0] << "\n";
      }
   }
   return 0;
}

/* my output
Enter your first name, middle name or initial and last name in that order
John Quincy Public
Public, John Q.
*/

Last edited by Dave Sinkula; Dec 2nd, 2005 at 12:20 am. Reason: Changed output to include vector size checking.

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Join Date: Dec 2005

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fidelljf

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Re: need help on C-string

Dec 2nd, 2005

i could have used strings for the middle name which would be the same thing, i was just trying a couple of different things. i know how to use the vectors but I dont know how to use stringstreams. I got lost when you used: istringstream iss(line); while ( iss >> line ) I guess we are limited into using strings and vectors only. I tried to run your program but it would not work. And one more thing our instructor warned us of using one whole string and using getline. He suggested to use three different strings.

I modified my program so that I used three strings. thanks for your help

#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;

int main()
{ using namespace std;

string first_name, middle_name, last_name;

cout << "Enter your first name, middle name or initial and last name in that order\n";
cin >> first_name >> middle_name >> last_name;
cout << endl;
cout << last_name << ", " << first_name << " " << middle_name[0] << "." << endl;

return 0;
}

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Join Date: Jul 2005

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Lerner

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Re: need help on C-string

Dec 2nd, 2005

That works if the user enters three names. If they only enter two names you will have the last name as the middle name, though.

If you're not familiar with stringstreams as demonstrated by Dave Sinkula you can parse the entire line using other techniques such as strtok() or your own method.