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Re: [Dev-C++] bool data type
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From: Abilash S. M. <abi...@wi...> - 2008-02-13 09:11:17
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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{
}
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