Please help--I'm a noob

So I'm just starting out with C++, and I thought I would try to program a simple calculator. My code seems good (to me :)), but when I try to run it, I get two errors:
1. It tells me "w" has not been defined, even thought I declared it in the do function
2. When I run the program, subtraction kinda works, but I get crazy answers for everything else (ex. 1 + 1 = 98)

Code:

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#include <iostream>
using namespace std;


int main (int x, int y, char z)
{
    do {
        bool w = 1;
        cout << "\nTo run program, press 1, to exit press 0\n";
        cin>> w;
    char Input [3];
    cout << "Enter any operation.\n";
    cout << "Only one digit numbers are allowed.\n";
    cout << "Use * for multiplication,\n";
    cout <<    "/ for division,\n";
    cout <<    "+ for addition,\n";
    cout <<    "and -for subtraction.\n";
    cin>> Input;
    x = Input [0];
    y = Input [2];
    z = Input [1];
    switch (z)
    {
    case '+':
        cout << "And the answer is " << x+y << "\n";
        break;
    case '-':
        cout << "And the answer is " << x-y << "\n";
        break;
    case '*':
        cout << "And the answer is " << x*y << "\n";
        break;
    case '/':
        cout << "And the answer is " << x/y << "\n";
        break;
    default:
        break;
    }
    } while (w == 1);


    system ("pause");
}

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No, I don't use comments.
I don't like them.

Thanks a million!

0) Just a suggestion: You're better off using "false" and "true" instead of "0" and "1"
00) main should be either "int main()" or "int main(int argc, char* argv[ ])"
1)You declare "w" inside the do-while body, while the condition is considered as outside the do-while body.
2) ASCII '1' has a value of 49 therefore '1'+'1' = 49+49 = 98

EDIT: Oh, wait 'till you see a few eyesores, and believe me, you'll come to love comments!
EDIT²: Don't mistake noob with newbie
EDIT³: Your variable naming is awfully awful... Try putting meaningful names like my post #8

Quote:

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No, I don't use comments.
I don't like them.

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That is a silly 'comment' to make Comments are essential, good code should speak for itself to the informed reader, but comments are expected as much as the code itself is. You have to illustrate certain things to yourself and other potential readers as you write your code. Not every single line, not every single declaration, just where it serves to indicate your train of thought and intention.

I am not saying you have to include comments with code snippets you post here, but you need to be aware of their use in the wider context of your work

oh ok. Thanks, and I'll use comments with larger programs, just thought they were unnecessary for this. How can I make my program compute this right (Without 1+1=98)?
Thanks

Quote:

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Originally Posted by Purples

How can I make my program compute this right (Without 1+1=98)?

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If you look at an ascii table, the numbers 0 to 9 are right next to each other, meaning they also have incremental values, with 0 being the smallest and 9 the highest. A simple formula would be to subtract the value of ASCII '0' from the user's input, like this:

Code:

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number = input[0] - '0';

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cin input?? besides anything to do with ascii values only one of your array values is 'sort of ' initialised, so what would you expect the answers to be?

Worked great! Thanks a bunch.

You're taking the long way though. You could just do:

Code:

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int num1, num2;
char oper;

cin >> num1 >> oper >> num2;

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( and maybe later check if they're lower than 10 or not )

>> char Input [3];
>> cin>> Input;
Do not ever do this. This is a fundamental security issue that can crash your computer (buffer overrun).
You should not use char arrays in C++. If you need a string, then use std::string. Reading into a std::string is safe.

Yes, prefer std::string over c-strings but this is also safe:

Code:

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char Input [3];
cin >> setw(3) >> Input;

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Jim