Alex wrote: “The last mistake is the dangerous case. In this case, the programmer mistakenly tries to initialize both variables by using one assignment statement.

1 int nValue1, nValue2 = 5; // wrong (nValue1 is uninitialized!)
2
3 int nValue1 = 5, nValue2 = 5; // correct

In the top statement, the nValue1 variable will be left uninitialized, and the compiler will NOT complain. This is a great way to have your program intermittently crash and produce sporadic results.”

But in section 1.3, “A first look at variables (and cin)” Alex had wrote:

“A variable that has not been assigned a value is called an uninitialized variable. Uninitialized variables are very dangerous because they cause intermittent problems (due to having different values each time you run the program). This can make them very hard to debug. Most modern compilers WILL print warnings at compile-time if they can detect a variable that is used without being initialized.”

And few lines before he wrote:

“Some newer compilers, such as Visual Studio 2005 Express will pop up a debug error message if you run this program from within the IDE.” (He means a program with an uninitialized variable.)

So, why here the compiler will not complain about the uninitialized variable???
(And can someone tell me, “wrote” is the past tense for “write” or not? :D)

int read( int x, int y)
{

	return x + y;
}

is kind of extra work if we can just declare the variables within the Main() function, and get the same output? for example:

int main()
{
	using namespace std;
	int x;
	cout << "enter first number here" << endl;
	cin >> x;
	int y;
	cout << "enter second number here" << endl;
	cin >> y;
	cout << x + y << endl;
	return 0;
}

this doesnt require any other functions to add 2 numbers from a user and give a result. but in the chapter 1 comprehension quiz we needed 2 functions to do what this single Main() function can do without the hassle. am i missing something? or does this seem so much easier? or maybe that’s why you made this more clear in the next chapter? just want to note, i do understand making a function to do this for us is beneficial for multiple addition problems, but for a single one, i find this is much simpler.

I also learned a whole lot more about declaring ints than from other tutorials.

I’m learning Computer Science through a college class, and we were taught to declare variables in the header files under the private section with functions under public…

Why? I’m a little confused and eager to learn, and sadly my professor doesn’t seem to be able to explain things too well. Help please!! :)

A question about declaring variables where they are used.
I am a bit old-style programmer and i cant find the arguments for declare variables when used to be so good.

Here is my reasoning (proove me wrong, so i can change my style :)
Lets see if we have 1000 lines of code. We have a function of 300 lines somewere inside (among other functions).
If we use function variables more than once inside that function, and they are declared on their first use, isnt it harder, later on, to find out which one is global and which is declared within those 300 lines?
Or just if we had all function variables just under function name – you can see on first glance which one is there and which one is global?