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Jul 26th, 2008

cannot convert bool to int

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hi,

i have the following code:

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

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sam1

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Jul 26th, 2008

Re: cannot convert bool to int

You need to go back to basics

but the below seems to work:

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();

}

iamthwee

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Jul 26th, 2008

Re: cannot convert bool to int

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

sam1

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Posting Whiz

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Jul 26th, 2008

Re: cannot convert bool to int

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

tesuji

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Jul 26th, 2008

Re: cannot convert bool to int

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!

Salem

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Jul 26th, 2008

Re: cannot convert bool to int

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

Post your entire code

iamthwee

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Jul 26th, 2008

Re: cannot convert bool to int

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

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();

}

sam1

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since Nov 2004

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Jul 26th, 2008

Re: cannot convert bool to int

^^ 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

sam1

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Posting Whiz

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Jul 26th, 2008

Re: cannot convert bool to int

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.

iamthwee

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Jul 27th, 2008

Re: cannot convert bool to int

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

Manutebecker

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