completely lost

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jimJohnson 2 Posting Whiz

16 Years Ago

Guys I am completely lost....what I want to do is make a loop to where the code im about to show. The issue is I need when I type a negative number in hotdogs, tacos, etc to make me type an error message and stop the code...here is my code and if I don't text wrap right let me know and show me how to do it right

//Assignment: Lab 2
//Date: 01/22/08
#include <iostream>
#include <string>
using namespace std;
const double TACO_COST = 0.49;   
const double HOTDOG_COST = 0.75;
const double DRINKS_COST = 0.99;
const double SOURCREAM_COST = 0.15;
const double TAX_RATE = 0.0725;
int sum = 0;
int count = 0;
int main ()
{



	int hotdogs, tacos, tacos_with_sourcream, drinks;
	double hotdogs_total_cost, tacos_total_cost, tacos_with_sourcream_total_cost, drinks_total_cost, subtotal, taxes, total_cost;
	char ans;



	cout << endl << "Programmed By: Bryan Kruep \n" <<endl;

	cout.setf(ios::fixed);
	cout.setf(ios::showpoint);
	cout.precision(2);


	do
	{

	


	cout << "Number of Hotdogs: ";
	cin >> hotdogs;



		
	cout << "Number of Tacos: ";
	cin >> tacos;

	

	

		
	cout << "How many of those tacos with sour cream: ";
	cin >> tacos_with_sourcream;
    cout << "Number of drinks: ";
	cin >> drinks;


	
	

	cout << endl << endl << endl << "BILL";
	cout << endl << "_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _";
    
	cout << endl << "\t" << hotdogs << " Hotdogs"; 
	cout << endl << "\t" << tacos << " Tacos" << " - " << tacos_with_sourcream << " with sour cream";
	cout << endl << "\t" << drinks << " Drinks";
	

	//Calculate totals
	hotdogs_total_cost = hotdogs * HOTDOG_COST;
	tacos_total_cost = tacos * TACO_COST;
	tacos_with_sourcream_total_cost = tacos_with_sourcream * SOURCREAM_COST;
	drinks_total_cost = drinks * DRINKS_COST;
	subtotal = hotdogs_total_cost + tacos_total_cost + tacos_with_sourcream_total_cost + drinks_total_cost;
	taxes = subtotal * TAX_RATE;
	total_cost = subtotal + taxes;

	//Display output

	cout << endl << endl << "Subtotal: " << subtotal;
	cout << endl << "Taxes: " << taxes;
	cout << endl << "Total: " << total_cost;
	cout << endl;

			sum = 0 ;
		cout << "Another order? (Y/N)";
		cin >> ans;
		cout << endl << endl;
	
 
	}while ( (ans != 'n') && (ans != 'N') );

	

return 0;
}

c++

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15 Replies
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Latest Post 16 Years Ago Latest Post by jimJohnson

All 15 Replies

Ancient Dragon 5,243 Achieved Level 70

16 Years Ago

you forgot to post the code you have written so far

[edit]Oops! you used wrong kind of tags which hid your code. [/edit]

Nick Evan 4,005 Industrious Poster

16 Years Ago

When you have all the input, just check if one of them is smaller then 0 and print a error message:

if (tacos < 0 || hotdogs < 0 ||  [etc...]   )
{
    cout << "Error message" << endl;
    return 0;
}

The || sign are two 'pipes' and mean: 'or'. So if tacos are smaller then 0 OR hotdogs are smaller then 0 OR (etc)

Niek

WaltP 2,905 Posting Sage w/ dash of thyme

16 Years Ago

When you have all the input, just check if one of them is smaller then 0 and print a error message:

Or better yet, wrap each input in a while loop that tests for <0:

inp = -1;    // force the value to be < 0
while (inp < 0)
{
    cout << "Input Value: ";
    cin  << inp;
    if (inp < 0)    // test the new value
    {
        cout << "try again" << endl;
    }
}

...and if I don't text wrap right let me know and show me how to do it right

Thanks for asking :) See this

Ancient Dragon 5,243 Achieved Level 70

16 Years Ago

you mean [code=c++] // your code here

[/code]

The above code tags will add line numbers and colorize your code.

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jimJohnson 2 Posting Whiz · Answer 1 · 2008-02-13T07:17:53+00:00

can anyone show me how to do with the tags to make them in color

jimJohnson 2 Posting Whiz · Answer 2 · 2008-02-13T09:37:56+00:00

still having problems this I what I came up with:

//Name: Bryan Kruep
//Class: CS 140-001
//Assignment: Lab 2
//Date: 01/22/08
#include <iostream>
#include <string>
using namespace std;
const double TACO_COST = 0.49;   
const double HOTDOG_COST = 0.75;
const double DRINKS_COST = 0.99;
const double SOURCREAM_COST = 0.15;
const double TAX_RATE = 0.0725;
int sum = 0;
int count = 0;
int main ()
{



	int hotdogquantity, tacoquantity, sourcreamquantity, drinkquantity;
	double hotdogs_total_cost, tacos_total_cost, tacos_with_sourcream_total_cost, drinks_total_cost, subtotal, taxes, total_cost;
	char ans;



	cout << endl << "Programmed By: Bryan Kruep \n" <<endl;

	cout.setf(ios::fixed);
	cout.setf(ios::showpoint);
	cout.precision(2);


	{

	
if (hotdogquantity >= 0)

{
	 


	cout << "Number of Hotdogs: ";
	cin >> hotdogquantity;
}
else 
cout << "Number of hotdogs cannot be a negative number!! Try again: ";

if (tacoquantity >= 0)
{

	cout << "Number of Tacos: ";
	cin >> tacoquantity;

}

else
cout << "Number of tacos cannot be a negative number!! Try again: ";

if (sourcreamquantity < tacoquantity)
{

	cout << "How many of those tacos with sour cream: ";
	cin >> sourcreamquantity;
}
else 
cout << "Can't have more tacos with sourcream than the number of tacos ordered. Number of sour creams cannot be a negative. Try again: ";

if (drinkquantity >= 0)
{
	cout << "Number of drinks: ";
	cin >> drinkquantity;
}
else

cout << "Number of drinks cannot be a negative number!! Try again: ";



	
	
	

	cout << endl << endl << endl << "BILL";
	cout << endl << "_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _";
    
	cout << endl << "\t" << hotdogquantity << " Hotdogs"; 
	cout << endl << "\t" << tacoquantity << " Tacos" << " - " << sourcreamquantity << " with sour cream";
	cout << endl << "\t" << drinkquantity << " Drinks";
	

	//Calculate totals
	hotdogs_total_cost = hotdogquantity * HOTDOG_COST;
	tacos_total_cost = tacoquantity * TACO_COST;
	tacos_with_sourcream_total_cost = sourcreamquantity * SOURCREAM_COST;
	drinks_total_cost = drinkquantity * DRINKS_COST;
	subtotal = hotdogs_total_cost + tacos_total_cost + tacos_with_sourcream_total_cost + drinks_total_cost;
	taxes = subtotal * TAX_RATE;
	total_cost = subtotal + taxes;

	//Display output

	cout << endl << endl << "Subtotal: " << subtotal;
	cout << endl << "Taxes: " << taxes;
	cout << endl << "Total: " << total_cost;
	cout << endl;

			sum = 0 ;
		cout << "Another order? (Y/N)";
		cin >> ans;
		cout << endl << endl;

 
}while ( (ans != 'n') && (ans != 'N') );

	

return 0;
}

John A 1,896 Vampirical Lurker Team Colleague · Answer 3 · 2008-02-13T09:58:35+00:00

It's times like this where I think it would be simpler to use a function. Follow the previous advice of WaltP, creating a while() loop. This function will keep looping until the user enters a non-negative integer.

int getPositiveInt() {

   int value = -1;
   cin >> value;

   // keep looping until user enters a non-negative number
   while (value < 0)
   {
      cout << "Error, please enter a non-negative number.\n";
      cin >> value;
   }

   return value;
}

To use, it's very simple:

cout << "Number of hot dogs: ";
hotdogquantity = getPositiveInt();

jimJohnson 2 Posting Whiz · Answer 4 · 2008-02-13T10:10:14+00:00

I originally used just the quantity as my integer but when I get down to the sourcream I need to display an error message if tacos with sourcream are more than the tacos quantity...wouldnt that mess it up?

John A 1,896 Vampirical Lurker Team Colleague · Answer 5 · 2008-02-13T10:51:58+00:00

Sorry, I didn't read through all your code. You'd have to do it manually for this one:

int sourcreamquantity = 0;
cin >> sourcreamquantity;

// keep looping until user enters less sourcream than tacos
while sourcreamquantity > tacoquantity)
{
   cout << "Error, tacos with sour cream must be less than total number of tacos.\n";
   cin >> sourcreamquantity;
}

jimJohnson 2 Posting Whiz · Answer 6 · 2008-02-13T11:51:36+00:00

guys im almost there I am getting 55 errors tho so I think I just about have it can anyone see what I am doing wrong it has to be something I can't find?

//Name: Bryan Kruep
//Class: CS 140-001
//Assignment: Lab 2
//Date: 01/22/08
#include <iostream>
#include <string>
using namespace std;
const double TACO_COST = 0.49;   
const double HOTDOG_COST = 0.75;
const double DRINKS_COST = 0.99;
const double SOURCREAM_COST = 0.15;
const double TAX_RATE = 0.0725;
int sum = 0;
int main ()
{

	int hotdogquantity, tacoquantity, sourcreamquantity = 0, drinkquantity;
	double hotdogs_total_cost, tacos_total_cost, tacos_with_sourcream_total_cost, drinks_total_cost, subtotal, taxes, total_cost;
	char ans;

	cout << endl << "Programmed By: Bryan Kruep \n" <<endl;

	cout.setf(ios::fixed);
	cout.setf(ios::showpoint);
	cout.precision(2);

	if (hotdogquantity >= 0)
{
	cout << "Number of Hotdogs: ";
	cin >> hotdogquantity;
}

while (hotdogquantity < 0)
{
	
cout << "Number of hotdogs cannot be a negative number!! Try again: ";
cin >> hotdogquantity;
}

if (tacoquantity >= 0)
{

	cout << "Number of Tacos: ";
	cin >> tacoquantity;
}

while (tacoquantity < 0)
{
cout << "Number of tacos cannot be a negative number!! Try again: ";
cin >> tacoquantity;
}

if (sourcreamquantity < tacoquantity)
{
	cout << "How many of those tacos with sour cream: ";
	cin >> sourcreamquantity;
}

while (sourcreamquantity > tacoquantity)
{

cout << "Can't have more tacos with sourcream than the number of tacos ordered. Number of sour creams cannot be a negative. Try again: ";
cin >> sourcreamquantity;
}

if (drinkquantity >= 0)
{
	cout << "Number of drinks: ";
	cin >> drinkquantity;
}
while (drinkquantity < 0)
(
cout << "Number of drinks cannot be a negative number!! Try again: ";
cin >> drinkquantity;
}


	cout << endl << endl << endl << "BILL";
	cout << endl << "_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _";
    
	cout << endl << "\t" << hotdogquantity << " Hotdogs"; 
	cout << endl << "\t" << tacoquantity << " Tacos" << " - " << sourcreamquantity << " with sour cream";
	cout << endl << "\t" << drinkquantity << " Drinks";
	
	//Calculate totals
	hotdogs_total_cost = hotdogquantity * HOTDOG_COST;
	tacos_total_cost = tacoquantity * TACO_COST;
	tacos_with_sourcream_total_cost = sourcreamquantity * SOURCREAM_COST;
	drinks_total_cost = drinkquantity * DRINKS_COST;
	subtotal = hotdogs_total_cost + tacos_total_cost + tacos_with_sourcream_total_cost + drinks_total_cost;
	taxes = subtotal * TAX_RATE;
	total_cost = subtotal + taxes;

	//Display output

	cout << endl << endl << "Subtotal: " << subtotal;
	cout << endl << "Taxes: " << taxes;
	cout << endl << "Total: " << total_cost;
	cout << endl;
	

		sum = 0 ;
		cout << "Another order? (Y/N)";
		cin >> ans;
		cout << endl << endl;

 }while ( (ans != 'n') && (ans != 'N') );

return 0;
}

jimJohnson 2 Posting Whiz · Answer 7 · 2008-02-13T12:23:45+00:00

jimJohnson 2 Posting Whiz

16 Years Ago

I have a feeling iot is in one of my braces

WaltP 2,905 Posting Sage w/ dash of thyme Team Colleague · Answer 8 · 2008-02-13T12:33:32+00:00

After a couple requests and an explanation on how to use them, you still refuse to use CODE tags. Is there a reason for this?

Nick Evan 4,005 Industrious Poster Team Colleague Featured Poster · Answer 9 · 2008-02-13T14:02:44+00:00

while (drinkquantity < 0)
(

This brace should be a curly one { not (

}while ( (ans != 'n') && (ans != 'N') );

This while is missing a do { Just place is somewhere after de declaration of ans.

READ THIS about using CODE TAGS. If you use indentation, you would have found the problems yourself. Here's a nice thread about it

Niek

jimJohnson 2 Posting Whiz · Answer 10 · 2008-02-13T17:26:03+00:00

and i do the same for the other 3 quantities right

jimJohnson 2 Posting Whiz · Answer 11 · 2008-02-13T17:32:20+00:00

nevermind figured it out...thanks everyone for your help

completely lost

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