Programming Forums > Application Development > C#

52Degrees · May 13th, 2006, 12:15 AM

I am sooo just beginning, thought I'd write a cute little program to estimate the cost to fill my gas tank. Unfortunately, it doesn't work. I was hoping someone could give me a pointer or two.

(Toggle Plain Text)

using System;

class GasPrices
{
    static void Main()
    {
        // c is current price per gallon, g is number of gallons
        Console.Write ("Enter price per gallon: ");
        decimal C = Int32.Parse(Console.ReadLine());
        Console.Write ("Enter price per gallon: ");
        decimal G = Int32.Parse(Console.ReadLine());
        decimal Total = C * G;
        Console.WriteLine ("The total cost is $" + Total);
    }
}

I'm assuming that my problem has something to do with incorrect format converting the price to an int. Hope I don't get too badly flamed for my lack of knowledge...

Thanks

Wizard1988 · May 13th, 2006, 12:31 AM

You should use the datatype float or double instead of decimal and parse it as a float or double.

(Toggle Plain Text)

using System;

class GasPrices
{
    static void Main()
    {
        // c is current price per gallon, g is number of gallons
        Console.Write("Enter price per gallon: ");
        double C = float.Parse(Console.ReadLine());
        Console.Write("Enter price per gallon: ");
        double G = float.Parse(Console.ReadLine());
        double Total = C * G;
        Console.WriteLine("The total cost is $" + Total);
    }
}

Jimbo · May 13th, 2006, 12:31 AM

I'm guessing you want to use Decimal.Parse instead of Int32.Parse. Also, your second prompt should be "Enter the number of gallons:" instead of "Enter the price per gallon"

52Degrees · May 13th, 2006, 12:57 AM

:banana:

Decimal.Parse did it! Thanks!

Great catch on the number of gallons quote. I must have been copying the first one.

This is fun stuff. I gotta learn some more though.

Ooble · May 13th, 2006, 6:49 AM

Quote:

Originally Posted by Wizard1988

You should use the datatype float or double instead of decimal and parse it as a float or double.

Just to sort something out: the Decimal type is designed for currencies. Because it stores each digit as, I believe, binary-coded decimal, it's not subject to the errors that can sometimes crop up when dealing with floating-point numbers.

52Degrees, glad ya got it figured out. There's a problem with your code though: if the user doesn't type a number, it'll crash. Check out the Decimal.TryParse method.

DaWei · May 13th, 2006, 7:40 AM

Quote:

if the user doesn't type a number, it'll crash.

That's MY line! :p

Ooble · May 13th, 2006, 8:42 AM

I learn, eventually.

52Degrees · May 13th, 2006, 11:08 AM

Quote:

Check out the Decimal.TryParse method.

I'll have to look that one up. I tried just using TryParse instead of Parse but got compile errors.

I'm using "Programming in the Key of C#" by Charles Petzold. I'm only on chapter 14. Reading to learn takes me longer than reading for entertainment

I'd like to take a class, but the local college isn't offering C# yet, only C++.

I ran into a guy from Sun Microsystems the other day. Sort of a friend of a friend. He gave me his number and told me he'd hook me up with a couple of local guys in charge of training people on J2EE (whatever that is).

Ooble · May 13th, 2006, 12:10 PM

J2EE stands for "Java 2, Enterprise Edition", I believe. Java's a language similar to C# - it's what C# is based on, in fact. It's worth learning both.

Booooze · May 13th, 2006, 12:28 PM

Quote:

Originally Posted by Ooble

J2EE stands for "Java 2, Enterprise Edition", I believe. Java's a language similar to C# - it's what C# is based on, in fact. It's worth learning both.

Many 'rumours' around, but C# is said to be the 'MS Java'. I've done Java, and I'm doing C#, I think I'm having such an easy time with C# because I've done Java. VB helped because it's the same environment. Althought I admit, I think it's easier to find Java resources on the net then C#.

May 13th, 2006, 12:15 AM	#1
52Degrees Newbie Join Date: May 2006 Location: Central Valley, Kalifornia Posts: 13 Rep Power: 0	My silly, simple gas price calculator I am sooo just beginning, thought I'd write a cute little program to estimate the cost to fill my gas tank. Unfortunately, it doesn't work. I was hoping someone could give me a pointer or two. (Toggle Plain Text) using System; class GasPrices { static void Main() { // c is current price per gallon, g is number of gallons Console.Write ("Enter price per gallon: "); decimal C = Int32.Parse(Console.ReadLine()); Console.Write ("Enter price per gallon: "); decimal G = Int32.Parse(Console.ReadLine()); decimal Total = C * G; Console.WriteLine ("The total cost is $" + Total); } } using System; class GasPrices { static void Main() { // c is current price per gallon, g is number of gallons Console.Write ("Enter price per gallon: "); decimal C = Int32.Parse(Console.ReadLine()); Console.Write ("Enter price per gallon: "); decimal G = Int32.Parse(Console.ReadLine()); decimal Total = C * G; Console.WriteLine ("The total cost is $" + Total); } } I'm assuming that my problem has something to do with incorrect format converting the price to an int. Hope I don't get too badly flamed for my lack of knowledge... Thanks

May 13th, 2006, 12:31 AM	#2
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 422 Rep Power: 4	You should use the datatype float or double instead of decimal and parse it as a float or double. (Toggle Plain Text) using System; class GasPrices { static void Main() { // c is current price per gallon, g is number of gallons Console.Write("Enter price per gallon: "); double C = float.Parse(Console.ReadLine()); Console.Write("Enter price per gallon: "); double G = float.Parse(Console.ReadLine()); double Total = C * G; Console.WriteLine("The total cost is $" + Total); } } using System; class GasPrices { static void Main() { // c is current price per gallon, g is number of gallons Console.Write("Enter price per gallon: "); double C = float.Parse(Console.ReadLine()); Console.Write("Enter price per gallon: "); double G = float.Parse(Console.ReadLine()); double Total = C * G; Console.WriteLine("The total cost is $" + Total); } }

May 13th, 2006, 8:42 AM	#7
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	I learn, eventually. __________________ Me :: You :: Them

May 13th, 2006, 12:10 PM	#9
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	J2EE stands for "Java 2, Enterprise Edition", I believe. Java's a language similar to C# - it's what C# is based on, in fact. It's worth learning both. __________________ Me :: You :: Them

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May 13th, 2006, 12:31 AM	#3
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 770 Rep Power: 3	I'm guessing you want to use Decimal.Parse instead of Int32.Parse. Also, your second prompt should be "Enter the number of gallons:" instead of "Enter the price per gallon"

May 13th, 2006, 12:57 AM	#4
52Degrees Newbie Join Date: May 2006 Location: Central Valley, Kalifornia Posts: 13 Rep Power: 0	:banana: Decimal.Parse did it! Thanks! Great catch on the number of gallons quote. I must have been copying the first one. This is fun stuff. I gotta learn some more though.

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Programming Forums > Application Development > C#

My silly, simple gas price calculator