dev-cpp-users

[Dev-C++] bool data type

[Shawn <tre...@gm...>]

This is the first time that I'm trying to use C's build in data type for 
true/false and I'm having some problems.

Basically, I'm trying to use bool to keep the program from displaying 
results if invalid data is entered.

  if (weight <= 0 || weight > 20000)
    cout<<"Please enter either a positive number or a weight of 20 
kilograms or less for your package.\t\t";

  if (distance < 10 || distance > 3000)
    cout<<"We don't ship to distances of less then 10 miles or more then 
3000 miles.\t\t";

If this is the case and they do enter invalid data, I want bool to stop 
the output of the program from printing on screen, I just want the 
program to tell the user that they need to enter the right information 
as prompted above. 
    
 cout<<"The total shipping charges for your package is 
$"<<setprecision(2)<<shippingCharges<<endl;

What's the best way to go about this?  I was thinking of declaring bool 
output = True in the beginning of the program and then right after those 
two input validation statements set output = false, but then what would 
I put just before the total shipping charges line so it wouldn't print?  
Also, I'm having problems setting output = false, it says false is 
undeclared.  I thought bool was a built in true/false data type?

thx

Re: [Dev-C++] bool data type

[pepone.onrez <pep...@gm...>]

dev...@li...

On Feb 12, 2008 12:09 AM, Shawn <tre...@gm...> wrote:>
>but then what would I put just before the total shipping charges line so it
wouldn't print?
if(output == TRUE){
        //output is TRUE to what you whan
}else{



> }
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

Re: [Dev-C++] bool data type

[Shawn <tre...@gm...>]

Thanks, but the compiler is still saying 'TRUE' undeclared (first use 
this function) and points me to the line where I initialize it to TRUE 
at the beginning of my program.
 
bool output = TRUE;

I thought that as soon as you call bool, the compiler knows it's either 
going to be true or false? 

pepone.onrez wrote:
> dev...@li... 
> <mailto:dev...@li...>
>
> On Feb 12, 2008 12:09 AM, Shawn <tre...@gm... 
> <mailto:tre...@gm...>> wrote:>
> >but then what would I put just before the total shipping charges line 
> so it wouldn't print?
> if(output == TRUE){
>         //output is TRUE to what you whan
> }else{
>
>  
>
>     }
>
>     -------------------------------------------------------------------------
>     This SF.net email is sponsored by: Microsoft
>     Defy all challenges. Microsoft(R) Visual Studio 2008.
>     http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
>     _______________________________________________
>     Dev-cpp-users mailing list
>     Dev...@li...
>     <mailto:Dev...@li...>
>     TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
>     https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> ------------------------------------------------------------------------
>
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>   

Re: [Dev-C++] bool data type

[Lloyd <ll...@cd...>]

//C does not have bool data type
enum
{
 FALSE=0,
 TRUE=1
};

typedef int bool;

int main()
{
 bool a=TRUE;
}


On Mon, 2008-02-11 at 18:36 -0500, Shawn wrote:
> Thanks, but the compiler is still saying 'TRUE' undeclared (first use
> this function) and points me to the line where I initialize it to TRUE
> at the beginning of my program.
>   
> bool output = TRUE;
> 
> I thought that as soon as you call bool, the compiler knows it's
> either going to be true or false?  
> 
> pepone.onrez wrote: 
> > dev...@li...
> > 
> > On Feb 12, 2008 12:09 AM, Shawn <tre...@gm...> wrote:>
> > >but then what would I put just before the total shipping charges
> > line so it wouldn't print?
> > if(output == TRUE){
> >         //output is TRUE to what you whan
> > }else{
> > 
> >  
> >         }
> >         
> >         -------------------------------------------------------------------------
> >         This SF.net email is sponsored by: Microsoft
> >         Defy all challenges. Microsoft(R) Visual Studio 2008.
> >         http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> >         _______________________________________________
> >         Dev-cpp-users mailing list
> >         Dev...@li...
> >         TO UNSUBSCRIBE:
> >         http://www23.brinkster.com/noicys/devcpp/ub.htm
> >         https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> > 
> > 
> > ____________________________________________________________________
> > 
> > -------------------------------------------------------------------------
> > This SF.net email is sponsored by: Microsoft
> > Defy all challenges. Microsoft(R) Visual Studio 2008.
> > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> > 
> > ____________________________________________________________________
> > 
> > _______________________________________________
> > Dev-cpp-users mailing list
> > Dev...@li...
> > TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> > https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >   
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________ Dev-cpp-users mailing list Dev...@li... TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm https://lists.sourceforge.net/lists/listinfo/dev-cpp-users


______________________________________
Scanned and protected by Email scanner

Re: [Dev-C++] bool data type

[Shawn <tre...@gm...>]

I'm working with C++ though, my book says that the bool data type is a 
built-in type consisting of just two values, the constants true and false. 

I have the program compiling without error now, however, it still prints 
the last statement even though I didn't enter valid data. 

int main()
{

//Declare and initialize variables
  float weight = 0.0;
  float distance = 0.0;
  float shippingRate = 0.0;
  float shippingCharges = 0.0;
*  bool output = true;*


//Intro
  cout<<endl;
  cout<<"Thank you for shipping with The Fast Freight Company!!!\n\n";


//Prompt user for the weight of their package
  cout<<"Please enter the weight of your pacakge(in grams): ";
  cin>>weight;
  cout<<endl;
  if (weight <= 0 || weight > 20000)
    {cout<<"Please enter either a positive number or a weight of 20 
kilograms or less for your package.\t\t";
    *output == false;*}
 
//Prompt user for distance the package will travel
  cout<<"Please enter the distance the package will travel(in miles): ";
  cin>>distance;
  cout<<endl;
  if (distance < 10 || distance > 3000)
    {cout<<"We don't ship to distances of less then 10 miles or more 
then 3000 miles.\t\t";
    *output == false;*}


//Evaluate weight input
   if (weight <= 2000)
     shippingRate = 1.10;
   else if (weight > 2000 && weight <= 6000)
     shippingRate = 2.20;
   else if (weight > 6000 && weight <= 10000)
     shippingRate = 3.70;
   else
     shippingRate = 4.80;

    
//Evaluate distance input
  if (distance >= 10 && distance <= 500)
    distance = 500;
  else if (distance >= 501 && distance <=1000)
    distance = 1000;
  else if (distance >= 1001 && distance <= 1500)
    distance = 1500;
  else if (distance >= 1501 && distance <= 2000)
    distance = 2000;
  else if (distance >= 2001 && distance <= 2500)
    distance = 2500;
  else
    distance = 3000;
   
    
//Perform the calculations    
   shippingCharges = shippingRate * (distance/500);
    
//Evaluate if output is needed
//if (weight > 0 && weight <= 20000 && distance >= 10 && distance <= 3000)
      *if (output == true) *
//Output shipping charges
      {cout<<fixed<<showpoint;
      cout<<"The total shipping charges for your package is 
$"<<setprecision(2)<<shippingCharges<<endl;}

    return 0;
}

When I enter 0 for both or just one prompt, the program still displays 
both the total shipping charges as $6.60 and the input validation message. 

When I uncomment out the *if (weight > 0 && weight <= 20000 && distance 
 >= 10 && distance <= 3000) *line, it works just fine so I have to be 
using bool wrong somehow.

Lloyd wrote:
> //C does not have bool data type
> enum
> {
>  FALSE=0,
>  TRUE=1
> };
>
> typedef int bool;
>
> int main()
> {
>  bool a=TRUE;
> }
>
>
> On Mon, 2008-02-11 at 18:36 -0500, Shawn wrote:
>   
>> Thanks, but the compiler is still saying 'TRUE' undeclared (first use
>> this function) and points me to the line where I initialize it to TRUE
>> at the beginning of my program.
>>   
>> bool output = TRUE;
>>
>> I thought that as soon as you call bool, the compiler knows it's
>> either going to be true or false?  
>>
>> pepone.onrez wrote: 
>>     
>>> dev...@li...
>>>
>>> On Feb 12, 2008 12:09 AM, Shawn <tre...@gm...> wrote:>
>>>       
>>>> but then what would I put just before the total shipping charges
>>>>         
>>> line so it wouldn't print?
>>> if(output == TRUE){
>>>         //output is TRUE to what you whan
>>> }else{
>>>
>>>  
>>>         }
>>>         
>>>         -------------------------------------------------------------------------
>>>         This SF.net email is sponsored by: Microsoft
>>>         Defy all challenges. Microsoft(R) Visual Studio 2008.
>>>         http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
>>>         _______________________________________________
>>>         Dev-cpp-users mailing list
>>>         Dev...@li...
>>>         TO UNSUBSCRIBE:
>>>         http://www23.brinkster.com/noicys/devcpp/ub.htm
>>>         https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>>>
>>>
>>> ____________________________________________________________________
>>>
>>> -------------------------------------------------------------------------
>>> This SF.net email is sponsored by: Microsoft
>>> Defy all challenges. Microsoft(R) Visual Studio 2008.
>>> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
>>>
>>> ____________________________________________________________________
>>>
>>> _______________________________________________
>>> Dev-cpp-users mailing list
>>> Dev...@li...
>>> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
>>> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>>>   
>>>       
>> -------------------------------------------------------------------------
>> This SF.net email is sponsored by: Microsoft
>> Defy all challenges. Microsoft(R) Visual Studio 2008.
>> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
>> _______________________________________________ Dev-cpp-users mailing list Dev...@li... TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>>     
>
>
> ______________________________________
> Scanned and protected by Email scanner
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>
>   

Re: [Dev-C++] bool data type

[Abilash S. M. <abi...@wi...>]

Hi,

Looks like u intended 

output = false

instead of 

output == false

 

The reason why you always get the o/p is because only true assignment
statement was 

  bool output = true;

So the variable is always true and you always get the output. 

 

 

Abilash Sankar Mohan

  _____  

From: dev...@li...
[mailto:dev...@li...] On Behalf Of Shawn
Sent: Tuesday, February 12, 2008 10:34 AM
To: ll...@cd...
Cc: dev...@li...
Subject: Re: [Dev-C++] bool data type

 

I'm working with C++ though, my book says that the bool data type is a
built-in type consisting of just two values, the constants true and false.  

I have the program compiling without error now, however, it still prints the
last statement even though I didn't enter valid data.  

int main()
{

//Declare and initialize variables
  float weight = 0.0;
  float distance = 0.0;
  float shippingRate = 0.0;
  float shippingCharges = 0.0;
  bool output = true;


//Intro
  cout<<endl;
  cout<<"Thank you for shipping with The Fast Freight Company!!!\n\n";


//Prompt user for the weight of their package
  cout<<"Please enter the weight of your pacakge(in grams): ";
  cin>>weight;
  cout<<endl;
  if (weight <= 0 || weight > 20000)
    {cout<<"Please enter either a positive number or a weight of 20
kilograms or less for your package.\t\t";
    output == false;}
  
//Prompt user for distance the package will travel
  cout<<"Please enter the distance the package will travel(in miles): ";
  cin>>distance;
  cout<<endl;
  if (distance < 10 || distance > 3000)
    {cout<<"We don't ship to distances of less then 10 miles or more then
3000 miles.\t\t";
    output == false;}


//Evaluate weight input 
   if (weight <= 2000)
     shippingRate = 1.10;
   else if (weight > 2000 && weight <= 6000)
     shippingRate = 2.20;
   else if (weight > 6000 && weight <= 10000)
     shippingRate = 3.70;
   else 
     shippingRate = 4.80;

     
//Evaluate distance input 
  if (distance >= 10 && distance <= 500)
    distance = 500;
  else if (distance >= 501 && distance <=1000)
    distance = 1000;
  else if (distance >= 1001 && distance <= 1500)
    distance = 1500;
  else if (distance >= 1501 && distance <= 2000)
    distance = 2000;
  else if (distance >= 2001 && distance <= 2500)
    distance = 2500;
  else 
    distance = 3000;
    
     
//Perform the calculations     
   shippingCharges = shippingRate * (distance/500);
     
//Evaluate if output is needed 
//if (weight > 0 && weight <= 20000 && distance >= 10 && distance <= 3000) 
      if (output == true) 
//Output shipping charges 
      {cout<<fixed<<showpoint;
      cout<<"The total shipping charges for your package is
$"<<setprecision(2)<<shippingCharges<<endl;}

    return 0;
}

When I enter 0 for both or just one prompt, the program still displays both
the total shipping charges as $6.60 and the input validation message.  

When I uncomment out the if (weight > 0 && weight <= 20000 && distance >= 10
&& distance <= 3000) line, it works just fine so I have to be using bool
wrong somehow. 

Lloyd wrote: 

//C does not have bool data type
enum
{
 FALSE=0,
 TRUE=1
};
 
typedef int bool;
 
int main()
{
 bool a=TRUE;
}
 
 
On Mon, 2008-02-11 at 18:36 -0500, Shawn wrote:
  

Thanks, but the compiler is still saying 'TRUE' undeclared (first use
this function) and points me to the line where I initialize it to TRUE
at the beginning of my program.
  
bool output = TRUE;
 
I thought that as soon as you call bool, the compiler knows it's
either going to be true or false?  
 
pepone.onrez wrote: 
    

dev...@li...
 
On Feb 12, 2008 12:09 AM, Shawn  <mailto:tre...@gm...>
<tre...@gm...> wrote:>
      

but then what would I put just before the total shipping charges
        

line so it wouldn't print?
if(output == TRUE){
        //output is TRUE to what you whan
}else{
 
 
        }
        
 
-------------------------------------------------------------------------
        This SF.net email is sponsored by: Microsoft
        Defy all challenges. Microsoft(R) Visual Studio 2008.
        http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
        _______________________________________________
        Dev-cpp-users mailing list
        Dev...@li...
        TO UNSUBSCRIBE:
        http://www23.brinkster.com/noicys/devcpp/ub.htm
        https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
 
 
____________________________________________________________________
 
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
 
____________________________________________________________________
 
_______________________________________________
Dev-cpp-users mailing list
Dev...@li...
TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
  
      

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________ Dev-cpp-users mailing list
Dev...@li... TO UNSUBSCRIBE:
http://www23.brinkster.com/noicys/devcpp/ub.htm
https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
    

 
 
______________________________________
Scanned and protected by Email scanner
 
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
Dev-cpp-users mailing list
Dev...@li...
TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
https://lists.sourceforge.net/lists/listinfo/dev-cpp-users