Emergency help error issue!

[BLooDiEMuRDA]

I have two diverse versions of Microsoft Visual Studio, one that is 2010 Ultimate, and the other that is 2010 Express Edition. So just the other day I was debugging on my C++ 2010 Ultimate in 32Console APP. I was practicing booleans, if, and else statements. I had absolutely no problems displayed what so ever, my debugging came out with no issues. Today I debug and I get an error that says Run-Time Check Failure #3 - The variable 'validNumber' is being used without being initialized., and it gives me the option to "BREAK" or "CONTINUE". So I said to myself either I am doing something wrong or 'it must be the program its self?' then I decided to use Visual studio 2010 express edition, and yet I get the same issue. Here's the issue that I did not have with the other day using this code:

#include "stdafx.h"
#include <iostream>

using namespace std;

int main(void)
{
system("color 0e");

int x = 0;
int y = 0;

bool validNumber;
while (validNumber==false)

{
cout<<"Type a number inbetween 5 through 10"<<endl;
cin>>x;
cout<<"You Entered: "<<x<<endl<<endl;

if ((x<5)||(x>10))
{
cout<<"You have entered an invalid number that is out of range"<<endl
<<"Please try again and enter within' the range"<<endl;
}
else validNumber=true;
}
cout<<"Thank you for participating"<<endl;

system("Pause");
return 0;
}

//it tells me The variable 'validNumber' is being used without being initialized.
//How is this so if just the other day I was writing this exact code and it came perfect?
//I bet if you type in that exact code you might not have no problems...

[kbw]

You'll need to be more specific about what you're running and what you see. But do not reinstall your OS.

[Mathhead200]

Um... Post some code (and don't reinstall your OS...?)

[Moschops]

Well, the code is bad (you are using variables without assigning values to them) so if it wasn't working before, it is now.

bool validNumber;
while (validNumber==false)

You test validNumber, but it could be anything at that point. You never assigned a value to it.

[BLooDiEMuRDA]

It was working before though... I never had a run time failure check stating 'validNumber' is being used without being initialized. So my question is, why is it that it was working before, and now all of a sudden the next day... it gives me a failure check?

[BLooDiEMuRDA]

If the code is bad then, how would I assign a value from your suggestion? if you can show me an example? it just scares me because im thinking something was deleted in the programs .dll's or something lol? so idk...

[kbw]

Unless you post your code and possibly your input, the best we can do is speculate on what's wrong.

[BLooDiEMuRDA]

I did post the code up there ^
So I have to assign a value for valid?
how do I assign a value for valid and where? is it suppose to be where the header files are at?

[kbw]

See Moschops's reply above.

[Moschops]

So I have to assign a value for valid?

Here is how to assign a value. If you really couldn't work this out, I think you need to go back to basics and start learning again at the very beginning. It seems very odd, because you wrote this code that assigns the value 0 to int x and int y.

int x = 0;
int y = 0;

I'm going to use an int in my example, but it could be a bool, or a double, or any other type.

int x; // x is now created but has no value assigned to it. It could be anything
x = 7; // now the value 7 has been assigned. x is seven. 

Here is another way to do the same thing.

int x = 7;

Here's a bool example, in which I assign the value false to a bool named validNumber.

bool validNumber = false;

Here's another way to do the same thing.

bool validNumber;
// If I use validNumber on this line, it could be any random value.
validNumber = false;
// Now, if I use validNumber on this line, it definitely has a known value