Microsoft Visual C#2008 Homework Help please

tincat

Hi - if anyone can get me started on this I'd be very grateful. I'm just starting a course in C#, and am stuck on the start of a problem:

It's a console application

I need to declare a string array of 3 options for a user to choose from:

small, medium and large

So far I've got the following code below, but it's not working:
When I enter a number, it comes up with the line
"You have chosen the {0} size". How can I get it to say "you have chosen the small size or similar?

Many thanks

_______________________________________________

string[] size = new string[3];

size[0] = "Small";
size[1] = "Medium";
size[2] = "Large";

Console.WriteLine("Enter size required: Small = 1, Medium = 2, Large = 3: {0},{1},{2}", size[0], size[1], size[2]);
Console.ReadLine();
Console.WriteLine("You have chosen the {0} size");
Console.ReadLine();

mr_fishbulb

I'm guessing you can't put the {0} in the quotation marks.

Maybe something like this:
Console.WriteLine("You have chosen the" {0} "size");

Or you may need to write the first part:
Console.WriteLine("You have chosen the"

Then a command to output the {0}

Then a command to put the final "size"

tincat

Thanks for your help, unfortunately by doing that brought up loads of errors.

I have now got the following, but somehow it always reads as though 'you have chosen the small size', regardless of whether I enter 1, 2, or 3 in the console.

If you can suggest anything else I'll try. Thanks

______________________

string[] size = new string[3];

size[0] = "small";
size[1] = "medium";
size[2] = "large";

Console.WriteLine("Enter size required: small = 1, medium = 2, large = 3:");
Console.ReadLine();
Console.WriteLine("You have chosen the {0} size", size[0], size[1], size[2]);
Console.ReadLine();

mr_fishbulb

I'm not a programmer, but having another look the second line Console.ReadLine(); it looks like it takes what number the user enters, but doesn't do anything with it.

Don't you need to use the input from that to set the size variable?

tincat

Probably. That could be it. I'll see if I can look that up, thanks

Punky_Guy

Firstly your second writeline doesn't pass in the size array parameter so it just echoes out {0}.
The code should be:

string[] size = new string[3];

size[0] = "Small";
size[1] = "Medium";
size[2] = "Large";

Console.WriteLine("Enter size required: Small = 1, Medium = 2, Large = 3: {0},{1},{2}", size[0], size[1], size[2]);
int result = int.Parse(Console.ReadLine());
Console.WriteLine("You have chosen the {0} size", size[result-1]);
Console.ReadLine();

Note you have to read in the result of the size you want, convert it to a number (int.parse) and then use that with your placeholder.

Anything else you need, just shout.

tincat

Thank you very very much:T

It's a complete mystery to me how programs work, and can only hope I'll understand by course end.

Punky_Guy

tincat wrote: »

Thank you very very much:T

It's a complete mystery to me how programs work, and can only hope I'll understand by course end.

No worries mate. If you have any more questions just give me a shout. We were all there once upon a time

mr_fishbulb

BooYa!!!!

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string sizeNum;         // create the variable called sizeNum as a string
            
            System.Console.WriteLine("Enter size required: Small = 1, Medium = 2, Large = 3 : ");
            sizeNum = System.Console.ReadLine();        // sets sizeNum as what the user enters
            if (sizeNum == "1")
            {
                System.Console.WriteLine("You have chosen the Small size.");
            }
            else if (sizeNum == "2")
            {
                System.Console.WriteLine("You have chosen the Medium size.");
            }
            else if (sizeNum == "3")
            {
                System.Console.WriteLine("You have chosen the Large size.");
            }
            else
            {
                System.Console.WriteLine("You have entered the wrong size!!!. Program will now fall over.");
            }                       
        }
    }
}

OK. Not as nice as Phunky Guy's but it works.

tincat

If you could be so helpful again:

How do you phrase it if you want the user to enter a size, which would be assigned to X if it falls between 100 and 1000, but would be an invalid entry if any other value was entered?

What I am trying is the following:
________________________
float X;
A1: Console.Write("Please enter number, between 100 and 1000: ");
X = float.Parse(Console.ReadLine());
if (X<"100")|(X>"1000");
goto B1;

B1:
{
Console.WriteLine("You did not enter a valid number: ");
goto A1;
}
_______________
But I get stuck there. It also looks v. clumsy

I don't know if 'if' is the best one to use, and I want to be able to assign the value between 100 and 1000 to X.

RobTang

DO NOT LET ANYONE ELSE SEE THAT YOU USE GOTO STATEMENTS, GET RID OF THEM AND NEVER USE THEM AGAIN (except in switch)

ok with that over, what your codes does is

---

IF (x is betwwen 100 and 1000) then do nothing.

GOTO B (goes to

Writes the line

GOTO A1 (goes back to a1)

---

a while construct is better in this case, you dont need an if