DaniWeb Forum Index > Software Development > C++

C++ RSS

cannot convert bool to int

Please support our C++ advertiser: Intel Parallel Studio Home

•

Join Date: Nov 2004

Posts: 257

Reputation: sam1 is an unknown quantity at this point

Solved Threads: 1

sam1

Offline

Posting Whiz in Training

cannot convert bool to int

Jul 26th, 2008

hi,

i have the following code:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
using namespace std;
 
class test{
 
public:: bool t()
{
cout<<"enter your answer(y or n)\n";
 
int answer = 0;
cin>>answer;
 
if (answer =='y') return true;
else return false;
}
 
};
 
int main(void){
 
test t;
return t.t;
 
}
#include <iostream>
using namespace std;

class test{

public:: bool t()
{
cout<<"enter your answer(y or n)\n";

int answer = 0;
cin>>answer;

if (answer =='y') return true;
else return false;
}

};

int main(void){

test t;
return t.t;

}

i get this error: cannot convert bool to int......... can anyone help me i am a newbie, the concept is fine i think as i am creating object of the class and calling the method in that class.

thanks

Last edited by Tekmaven; Jul 26th, 2008 at 2:14 pm. Reason: Code tags

•

Join Date: Aug 2005

Posts: 5,264

Reputation: iamthwee is a splendid one to behold

Solved Threads: 377

iamthwee

Offline

Posting Expert

Re: cannot convert bool to int

Jul 26th, 2008

You need to go back to basics

but the below seems to work:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
using namespace std;
 
class test
{
 
  public:
  bool t()
  {
    cout << "enter your answer(y or n)\n";
 
    char answer;
    cin >> answer;
 
    if ( answer == 'y' ) return true;
    else return false;
  }
 
};
 
int main ( void )
{
 
  test foo;
  cout << foo.t();
  cin.get();
  cin.get();
 
}
#include <iostream>
using namespace std;

class test
{

  public:
  bool t()
  {
    cout << "enter your answer(y or n)\n";

    char answer;
    cin >> answer;

    if ( answer == 'y' ) return true;
    else return false;
  }

};

int main ( void )
{

  test foo;
  cout << foo.t();
  cin.get();
  cin.get();

}

*Voted best profile in the world*

•

Join Date: Nov 2004

Posts: 257

Reputation: sam1 is an unknown quantity at this point

Solved Threads: 1

sam1

Offline

Posting Whiz in Training

Re: cannot convert bool to int

Jul 26th, 2008

thanks for quick reply, as i said i am a newbie

now i get the following error when compiling:

gcc class.cpp
/tmp/cc1LNGYB.o: In function `__static_initialization_and_destruction_0(int, int)':
class.cpp

.text+0x23): undefined reference to `std::ios_base::Init::Init()'
/tmp/cc1LNGYB.o: In function `__tcf_0':
class.cpp

.text+0x6c): undefined reference to `std::ios_base::Init::~Init()'
/tmp/cc1LNGYB.o: In function `main':
class.cpp

.text+0x98): undefined reference to `std::cout'
class.cpp

.text+0x9d): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(bool)'
class.cpp

.text+0xa4): undefined reference to `std::cin'
class.cpp

.text+0xa9): undefined reference to `std::basic_istream<char, std::char_traits<char> >::get()'
class.cpp

.text+0xb0): undefined reference to `std::cin'
class.cpp

.text+0xb5): undefined reference to `std::basic_istream<char, std::char_traits<char> >::get()'
/tmp/cc1LNGYB.o: In function `test::t()':
class.cpp

.text._ZN4test1tEv[test::t()]+0x11): undefined reference to `std::cout'
class.cpp

.text._ZN4test1tEv[test::t()]+0x16): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
class.cpp

.text._ZN4test1tEv[test::t()]+0x24): undefined reference to `std::cin'
class.cpp

.text._ZN4test1tEv[test::t()]+0x29): undefined reference to `std::basic_istream<char, std::char_traits<char> >& std::operator>><char, std::char_traits<char> >(std::basic_istream<char, std::char_traits<char> >&, char&)'
/tmp/cc1LNGYB.o

.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

•

Join Date: Apr 2008

Posts: 296

Reputation: tesuji is on a distinguished road

Solved Threads: 42

tesuji

Offline

Posting Whiz in Training

Re: cannot convert bool to int

Jul 26th, 2008

possibly #include <iostream> or using namespace std forgotten.

That also works: return answer == 'y' ;

instead of: if ( answer == 'y' ) return true; else return false;

krs,
tesu

Information is moving—you know, nightly news is one way, of course, but it's also moving through the blogosphere and through the Internets. I promise you I will listen to what has been said here, even though I wasn't here. Ann and I will carry out this equivocal message to the world. I'm the master of low expectations.

•

Join Date: Dec 2005

Posts: 5,850

Reputation: Salem has a reputation beyond repute

Solved Threads: 749

Salem

Offline

Void main'ers are DOOMed

Re: cannot convert bool to int

Jul 26th, 2008

You'd think someone with over 200 posts would have figured out either to use code tags, or turn off smilies.
At least enough to review the post before pressing submit.

What an unreadable mess!

•

Join Date: Aug 2005

Posts: 5,264

Reputation: iamthwee is a splendid one to behold

Solved Threads: 377

iamthwee

Offline

Posting Expert

Re: cannot convert bool to int

Jul 26th, 2008

>thanks for quick reply, as i said i am a newbie
>now i get the following error when compiling:

Post your entire code

*Voted best profile in the world*

•

Join Date: Nov 2004

Posts: 257

Reputation: sam1 is an unknown quantity at this point

Solved Threads: 1

sam1

Offline

Posting Whiz in Training

Re: cannot convert bool to int

Jul 26th, 2008

this is the entire code i have and i compile it under ubuntu gutsy using gcc class.cpp

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream.h>
using namespace std;
 
class test
{
 
  public:
  bool t()
  {
    cout << "enter your answer(y or n)\n";
 
    char answer;
    cin >> answer;
 
    if ( answer == 'y' ) return true;
    else return false;
  }
 
};
 
int main ( void )
{
 
  test foo;
  cout << foo.t();
  cin.get();
  cin.get();
 
}
#include <iostream.h>
using namespace std;

class test
{

  public:
  bool t()
  {
    cout << "enter your answer(y or n)\n";

    char answer;
    cin >> answer;

    if ( answer == 'y' ) return true;
    else return false;
  }

};

int main ( void )
{

  test foo;
  cout << foo.t();
  cin.get();
  cin.get();

}

•

Join Date: Nov 2004

Posts: 257

Reputation: sam1 is an unknown quantity at this point

Solved Threads: 1

sam1

Offline

Posting Whiz in Training

Re: cannot convert bool to int

Jul 26th, 2008

^^ i just got it right

....

i searched google and seems if you compile using g++ you wont get those header errors.

can anyone please explain to me the difference between g++ and gcc?

thanks

•

Join Date: Aug 2005

Posts: 5,264

Reputation: iamthwee is a splendid one to behold

Solved Threads: 377

iamthwee

Offline

Posting Expert

Re: cannot convert bool to int

Jul 26th, 2008

I always thought gcc was to compile c code, but don't quote me on that. Also in the code you posted the iostream.h shouldn't have the .h in it.

Last edited by iamthwee; Jul 26th, 2008 at 1:51 pm.

*Voted best profile in the world*

•

Join Date: May 2008

Posts: 51

Reputation: Manutebecker is an unknown quantity at this point

Solved Threads: 2

Manutebecker Manutebecker is offline

Offline

Junior Poster in Training

Re: cannot convert bool to int

#10

Jul 27th, 2008

What confuses me is that you are doing a cout on a function that you need to interact with... you should split the two into two seperate functions within the class, one being a setBool, the other being a getBool