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 <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{
>>>
>>>  
>>>         }
>>>         
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