I declared a variable cnt of ubyte first as part of the for loop initialiser to 3, then found it odd that the loop went infinite.

I ran through the debugger and first time through it correctly decrements value and cnt = 2, the next time round it went to -1, this did not happen when I declared the cnt to be an uint

I then initialised cnt outside the loop and got the same behaviour

The code was
for(ubyte cnt = 3; cnt > 0; --cnt)
{
    ...
    code here
}

DBloke:

> The code was
> for(ubyte cnt = 3; cnt > 0; --cnt)
> {
>     ...
>     code here
> }

This program:

import std.stdio: writeln;
void main() {
    for (ubyte i = 3; i > 0; --i) {
        writeln(i);
    }
}

Prints with dmd 2.047:
3
2
1

It's better to use the D.learn newsgroup for such questions.

Bye,
bearophile

Hmmm most strange, using same version of compiler as yours 2.047

I have attached the file for you to try, not sure if it makes a difference that I am running on 64 bit win7?

I am not after help, just to confirm there maybe a bug with either ubyte or == ?

Cheers

Your code works, here too:
http://ideone.com/Taq71

So maybe it's the 64 bit system that gives problems. Are you able to minimize your code, to show just the problem? So it will become a bug report for bugzilla.

By the way, the D.bugs group is not for general chat, use D.learn instead.

Bye,
bearophile

A different version of your code with some improvements:


import std.stdio, std.cstream, std.random;

void main() {
    uint chosen = uniform(1, 21);

    writeln("This is a guessing game");
    writeln("I have chosen a number between 1 and 20" ~
            " which you must guess");

    int guess = 0;

    foreach_reverse (i; 1 .. 4) {
        writefln("You have %s tr%s left.", i, i == 1 ? "y" : "ies");
        write("enter a guess: "); // prompt for a guess
        scanf("%d", &guess); // Read a guess

        // check if guess correct
        if (guess == chosen) {
            writefln("\nYou guessed it!");
            return;
        }

        // Check for an invalid guess
        if (guess < 1 || guess > 20) // you can add brackets here if you want
            writeln("I said between 1 and 20.");
        else
            writefln("Sorry. %s is wrong.", guess);
    }

    writefln("You have had three tries and failed. The number was %s", chosen);

    din.getc(); // useless?
}

Bye,
bearophile

Hi,
The new code you supplied in other post works fine, but the code in the link in
this post does not, after first try, says I have 255 tries and goes infinite on
me, this must be a bug for 64 bit windows? If I cahnge the ubyte to uint works
fine, I guess this must be a 64 bit issue

Thanks for tips :)