[TypeSK]

ok, i have a small program (i am only in my 2nd class of C++, but this is typically a intro C++ question ...)

this is also due tonight at midnight..so if anyone can help, that would be great ...

i forgot how the bool operator works ...

i am in C++ class, and am doing a class (object oriented programming?)

and in the class, i have functions ..

well, one of the functions go like this:

  void sequence::advance()
  {
    assert(is_item() == 'true');

    if (current_index == (used - 1))
      current_index = current_index;
    else
      current_index++;
  }

ok, the is_item() function call is a call to another boolean function (i still have to write this function) IGNORE THAT I HAVE "assert(is_item() == 'true');" (w/o quotes) right now, as i just put that there so i know to go back and change it to the right code, which is why im here asking ..

i know i can write this for the boolean function:

bool sequence::is_item() const
{
if (num2 == 10)
 return true;
else if (num2 != 10)
return false;
}

(remember, this is all in a class...but ignore that as the question doesnt really deal with that)

1. how does the bool work? when it says itll return true or false, is it going to return the char/string "true" or "false" or will it return 0 or 1 (i think 0 is false, 1 is true?) ?

2. based on what the bool function returns (in the function, as ive seen it written elsewhere to "return true" as in the is_item function), is this how i write the code: "assert(is_item() == 'true');" (w/o quotes) ?? or am i to write it another way?

if this sounds confusing, please reply and ill get back to you !! or ill be on AIM ...jaesunSK

thanks !!

[TypeSK]

ttt...

help anyone?

[codejockey]

Bools are basically integers, so "false" evaluates to 0 (binary zero, not ASCII zero) and true evaluates to non-zero (note the distinction: non-zero includes all values other than zero, not just, for example, binary 1). Often, true and false are #defined (e.g., #define FALSE 0). You should be making numeric comparisons, not string comparisons.

BTW: your is_item method could be made more efficient. Once you've checked for (num2 == 10), you can just use an else statement to capture all the other possibilities; there's no need to check that (num2 != 10) because that's the only possibility if execution has reached this line.

Hope this helps.

[TypeSK]

yea...i know...actually, i just threw something in there ... i think i did it right...here is the whole class function calls:

  void sequence::advance()
  {
    assert(is_item());

    while(is_item())
      {
        current_index++;
        break;
      }
  }

  bool sequence::is_item() const
  {
    if (current_index < used && current_index >= 0)
      return true;
    else
      return false;
  }

well, nevermind...i only put that function calls in....dont think youd care for what the rest of the code does ....

so i had it do the assert, and its right syntax, as it compiled ok, and worked ... and then i did a while the function is true to do the rest also ....

i just finished as you replied ... thanks though !!