i position of a string

I'm trying to work with some code like this:

Code:

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#include <string>
#include <vector>
#include <iostream>

using namespace std;
  int main(void){
  string letters="AAAAAA";
  int len=letters.size();
  for(int i=0; i<len; i++)cout<<" letters[i]="<<letters[i];
  return(0);
}

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I'm expecting it to return results like
letters[i]=A letters[i]=A letters[i]=A..... etc.
but it returns
letters[i]=AA letters[i]=AA letters[i]=AA

Point is, I'm expecting it to return one(1) character,
but it returns two(2). How do I get it to return only the
character in the string at position i?

Could maybe try...

Code:

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for(int i=0; i<len; i++)cout<<" letters[i]="<<letters.at(i);

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This code is correct,and works as expected ( letters[i]=A letters[i]=A letters[i]=A..... etc.).


@hk_mp5kpdw
at is [],but with index checking.

Quote:

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This code is correct,and works as expected ( letters[i]=A letters[i]=A letters[i]=A..... etc.).

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I am using Borland C++ and it returns letters[i]=AA !?
What gives?

Quote:

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code:--------------------------------------------------------------------------------for(int i=0; i<len; i++)cout<<" letters[i]="<<letters.at(i);

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what is the .at() ? ie-which library is needed and what does it do? Basically, I just need more info on it?

That code works fine on my compiler(gcc 3.2). at( ) is a member function of the string object...you don't need a special library for it. What version of Borland are you using?

Oh, sorry, forgot to mention that I'm using version 6 of Borland C++ Builder.
Also, I am getting a E2285 Could not find a match for 'argument(s)* Compiler error (No C++ function could be found with parameter matching the supplied arguments. Check parameters passed to function or overload function for parameterd that are being passed.) when I try to use

Code:

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cout<<" letters[i]="<<letters[i].at();

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Doesn't this indicate I need another library?

It is not letters[i].at(); but rather letters.at(i);

Quote:

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It is not letters[i].at(); but rather letters.at(i);

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Well, that compiles and runs, but it still retuns two(2) characters instead of one!?

Maybe it really is just 1 character...but for some reason it's not printing correctly or is printing out of order? That output you have there isn't formatted very well anyway. This probably isn't the case...just a suggestion

and an endl at the end, just for format's sake

Thats a rather strange problem... I got that code to work just fine in BCB 5, and Dev.

Is that the code you are working with, or is there more to this program?

I don't think it would make much of a difference but here is the entire code:

Code:

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#include <string>
#include <cstring>
#include <vector>
#include <iostream>

using namespace std;
class CeyKaps {
        public:
        string decipher(string typed, vector <string> switches) {
    string origMess=" ";
    int nochar=typed.size();
    int noswitches=switches.size();
    for(int i=0; i<noswitches; i++){
        for(int j=0; j<nochar; j++){
          cout<<typed[j];
          if(typed[j]==switches[i][1]){
                cout<<"yes";
                typed(j)=switches[i][0];
          }
          else if(typed[j]==switches[i][3])typed[j]=switches[i][2];
        }
    }
    return(typed);
 }
};
//
string main(void){
    string typed;
    vector <string> switches;
    typed="AAAAA";
    switches.push_back("A:B");
    switches.push_back("B:C");
    switches.push_back("A: D");
//
    CeyKaps p;
    cout<<"Original message: "<<p.decipher(typed,switches);
    cin>>"";  //pause console
}

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This is what I'm getting for output: [15 A's] + "Original Message:" + [5 A's]

Is this close to what you're getting? Where is the duplication occuring for you?

.

Quote:

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This is what I'm getting for output: [15 A's] + "Original Message:" + [5 A's]

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I'm getting the duplication here:

Code:

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cout<<"typed[j]="<<typed[j];

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note: I added <<"typed[j]="
I seem to have posted an older copy of the code instead of the latest

OK, I finally see it. I was printing typed or letters twice without realizing it. Changed string main to int main, but this was never the problem. Approach was correct but I had logic errors, which I've corrected and code appears to now work correctly.
Thanks.