anyone know C++? need help with code Intro to Comp Sci Class

[pstokely]

my textbook is C++ Programming today, author Barbara Johnston publisher Prentice Hall

this is the problem out of the book

"Write a complete C++ program that asks the user to input a character. Using the ASCII Character set as a guide, state whether the user's character is a digit (0 to 9), a letter (a to z or A to Z), or a symbol.

here is my code, my compiler is Microsoft Visual C++ 6.0, can't figure out the part about the letter and symbol

#include "stdafx.h"
#include <iostream>
#include <iomanip> //for setw()
using namespace std;

int main ()
{
char enter;
char runAgain = 'y';
int number;
char letter 'A'



const int lowestValidNumber = 1;
const int highesValidNumber = 9;

while (runAgain != 'n' && runAgain != 'N')
{
if (runAgain == 'y' || runAgain == 'Y')
{
cout << "\n Enter a letter, number, or symbol: ";
cin >> number;

if (number <= 9)

cout <<"\n '"<<number<<"' is a number" <<endl;



}

cout <<"\n Do another ? y = yes, n = no ";
cin >> runAgain;
cin.get(enter);
}
cout <<"\n Good Bye! Press ENTER to exit....";
cin.get(enter);
return 0;
}

[kar_the_terrible]

1. slight error in your variables

YOU WROTE:
 int number;
char letter 'A'



const int lowestValidNumber = 1;
const int highesValidNumber = 9;

while (runAgain != 'n' && runAgain != 'N')
{
if (runAgain == 'y' || runAgain == 'Y')
{
cout << "\n Enter a letter, number, or symbol:
";
cin >> number;

if (number <= 9)

cout <<"\n '"<<number<<"' is
a number" <<endl;

OK...
Here's the problem... we need to get a character from the
number.. so you need to first of all:

char c;
cin >> c;

Now, if the value in c is between '0' and '9' its obviously a
number, else if between 'a' to 'z' its an alphabet. We also
can use another trick.. in the ascii code 0-9 are continous,
and a-z are continuous. So we really dont need to knwo the
aSCII COdes per se... just do this

if ('0' <= c && '9' >= c) // we have a number
else if('a' <= c && 'z' >= c) // we have a
letter

[CanuckAmok]

2. Holy cats, I got a headache just opening this post!

I feel like Ralph Phillips, with the numbers trying to kill me.

[Elad]

3. Been awhile since I did C++, but...

First of all it looks like your lowestValidNumber and highestValidNumber are not only incorrect, but unused. You define them but don't use them. lowestValidNumber should also be 0, not 1.

Finally, I think what the problem is getting at is that in the ASCII charset, all characters are represented by an integer. If I'm remembering my C correctly you can differentiate between a number, alphabet character, or symbol by what it's integer value is in the ASCII charset, and I think that's what the problem is trying to get at.

[Syrinx]

4. it depends on the ascii character set

pseudocode:

if x < 48:
xtype = symbol
elif x < 58:
xtype = numeral
elif x < 65:

elif x < 91:
xtype = letter
elif x < 97:


I can't enter my example fully, because DU is acting weird and won't let me.

[burrowowl]

5. I hate to say this, but

you should spend a little less time on DU and more time cracking your books.

[Squeegee]

6. You need to ...

... put a couple of goto statement in there somewhere. You'll be guaranteed an A for sure! ;)

[Vladimir]

7. Nooooooo

NOT THE GOTO! Anything but the evil spaghetti code monster... brain melts away... :)

V