Breaking a String Chain

[Tec-Nico]

Excuse me.. How can I get a string chain and then beak it up to check letter by letter?

Here you have a sample of my code:

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

main()
{
 
/* int CharSize;
 int i;
 
 CharSize = 3;
 
 char CadChar[3];
 int Estado;*/

 int CharSize;
 int i;
 int Estado;
 
 char *CadChar;
 
 cout<<"Automata Finito"<<endl<<endl;
 
 cout<<"Dame una palabra: ";
 cin>>CadChar;
 cout<<endl;

 cout<<CadChar;

 CharSize = strlen(CadChar);
 
/* for(i=1; i <= CharSize; i++){
  cout<<"Dame una letra: ";
  cin>>CadChar[i];
  cout<<endl;
 }*/
 
 for(i=0; i < CharSize; i++){
 cout<<CadChar[i];
 }

 Estado = 0;
 
 for(i=0; i < CharSize; i++){
   if(CadChar[i] == 'a'){
   Estado = 0;
  }
  else{
   if(CadChar[i] == 'b' && Estado < 2){
    Estado++;
   }
   
  }
 }
 
 if(Estado == 2){
  cout<<"La cadena es valida"<<endl;
 }
 else{
  cout<<"La cadena es invalida"<<endl;
 }
 
 char a;
 cout<<endl<<endl<<"Presione cualquier tecla para terminar...";
 cin>>a;
 return 0;
}

What am I doing wrong?

[Jop]

First of all:

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

You're using deprecated headers, this is a common mistake by c++ beginners... always use the standard headers, they're defined without the .h extension.

Here's some code that uses a basic string (defined in <string>) and uses the at function to show the string letter by letter.. you can test for certain values too ofcourse.. this should get you started

#include <iostream> 
#include <string>
using namespace std;

int main()
{
	string sIn;
	int iLen;
		cout << "Please insert a string: " << endl;
		cin >> sIn;
	iLen = sIn.length();

	for (int x=0; x<iLen; x++){
		cout << sIn.at(x) << endl;
                //you can test things here
	}
	
return 0;
}

[Tec-Nico]

Thank you!

I am going to try it, though I found another way to solve it... And about the headers, I just copied my File from Turbo C... That is why I had so much trouble.. Oh well.. Thanks anyway!

[Jop]

Well it's valid for C applications, but for C++ it's recommend to use the new/standard header files...

and what's the other way you found? Always good to see alternatives

[CornedBee]

No, it's not valid for C applications, the iostream.h header declares some classes.

It's simply old C++. New C++ uses the headers without .h.

[CornedBee]

The other way could be use of the index operator, iterating with pointers through the return value of c_str(), iterating with iterators through the string - there are numerous ways.

[Tec-Nico]

Corned bee, you are right. It is old C++. Those headers are added like that in Dev-C.
I came with a way to solve what I asked, but I like more the one you proposed, Jop.

I am used to programming on VB and not on C++, but I used to program on C++ too, so it is just a matter of time to return to my old rhythm. Anyway, the logic used is the same in almost all languages (do not include small talk, it is an exception since it is purely OO)

Well, here is my solution:

#include <stdio> 
#include <iostream>
#include <string>

main()
{
int CharSize;
int i;

char CadChar[100]; //This would limit the word to 100 characters

  cout<<"Please give me a word: ";
  cin>>CadChar;
  cout<<endl; 

  CharSize = strlen(CadChar);

  for(i=0; i < CharSize; i++){
   cout<<CadChar[i]<<endl;
  }

return 0;
}

But as you can see the string is limited to 100 characters. In this case, I don't think anyone would type a word that would be longer than 100 characters. Anyway, it is a limitation... By the way, Isn't there a tag like "VCCode", soo it would color the code as VBCode?

Thank you very much

PS. Jop, what is this line for?
using namespace std;
Is it a comment? I don't think VC++ compilator would admit such a code line... I haven't tried to compile it, though.

PS2. Corned Bee, that way you said is what I was trying to do but I couldn't achieve it. I could do it on Turbo C... But not on VC++, how would you do it on VC++?

[CornedBee]

The user could type in a 100+ word intentionally to make the pc execute some random code for him. It's called buffer overflow

The
using namespace std;
is a valid C++ code line. Read up on namespaces: search this forum for posts by me with the word namespace - I've posted a long explanation a while ago.

The ways I proposed are all possible with VC++. I willl not do it now however.

[Tec-Nico]

Thanks for the info Corned Bee... But I searched for that word and I found 22 pages...

Tell me.. which of the subjects of all those 22 pages is the one in which you explained it?

[CornedBee]

My search turned up 7 threads. keyword "namespaces", searching for my exact username only in the C++ forum.

Anyway, here's the thread.
http://www.vbforums.com/showthread.p...ght=namespaces

[McCain]

That's a good post about namespaces, thank you!
There's just one thing I think should be changed...

This means that you have more than one function or global variable with different names, in different modules

Shouldn't it be "the same names" ?

[CornedBee]

Yep, thanks.