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Creating an OS

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Join Date: Oct 2006

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Tauren

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Re: Creating an OS

#41

Oct 31st, 2006

That was FUN!!!

But ERROR

a < 5 // Checks to see if a is less than five
a > 5 // Checks to see if a is greater than five
a == 5 // Checks to see if a equals five, for good measure

Could not compile

[code=c++ a < 5 // Checks to see if a is less than five
a > 5 // Checks to see if a is greater than five
a == 5 // Checks to see if a equals five, for good measure
[/code]

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Join Date: Apr 2006

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John A

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Re: Creating an OS

#42

Oct 31st, 2006

Those aren't entire C++ statements. They're just examples, or "snippets". For example, you could use one of the expressions like the following:

 Help with Code Tags 
 c++ Syntax (Toggle Plain Text) 
#include <iostream>
 
int main() {
int a = 6;
 
if (a>5) {
   std::cout << "The variable 'a' is larger than 5.\n";
}
}
#include <iostream>

int main() {
int a = 6;

if (a>5) {
   std::cout << "The variable 'a' is larger than 5.\n";
}
}

Those expressions at the end of the tutorial were just examples. I hope this makes sense.

Last edited by John A; Oct 31st, 2006 at 7:39 pm.

"Technological progress is like an axe in the hands of a pathological criminal."

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Join Date: Oct 2006

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Tauren

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Re: Creating an OS

#43

Nov 1st, 2006

Dont cin.get(); It keeps it from closing up

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Join Date: Apr 2006

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John A

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Re: Creating an OS

#44

Nov 1st, 2006

•

Originally Posted by Tauren

Dont cin.get(); It keeps it from closing up

Usually you want cin.get to execute when your program finishes on a compiler like Dev-C++. Why? Because users will usually double-click on your app, which will open a DOS prompt window, and when the program is done, the window will close immediately, so the user can't see the final messages printed out by the program.

On many compilers, cin.get is not needed, automatically append code to do this (Such as Visual C++) to save you the trouble.

"Technological progress is like an axe in the hands of a pathological criminal."

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Join Date: Oct 2006

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Tauren

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Re: Creating an OS

#45

Nov 2nd, 2006

Its alright I just have a question about the loops what the hell do they really do just when u put in anser it keeps the thing from just exiting oe what?

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Join Date: Jun 2006

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~s.o.s~

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Failure as a human

Re: Creating an OS

#46

Nov 2nd, 2006

Loops are a very important constructs in programming.

Imagine you want to gather data from 100 clients and put it in an array of client data. Imagine doing that without loop:

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
cout << "Enter data of client 1: " ;
cin >> record[0] ;
cout << "Enter data of client 2: " ;
cin >> record[1] ;
cout << "Enter data of client 3: " ;
cin >> record[2] ;
 
// ... and so on till 100
cout << "Enter data of client 1: " ;
cin >> record[0] ;
cout << "Enter data of client 2: " ;
cin >> record[1] ;
cout << "Enter data of client 3: " ;
cin >> record[2] ;

// ... and so on till 100

With loops its like:

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
for( int i = 0; i < 100; ++i )
{
    cout << "Enter data of client " << i + 1 << ": " ;
    cin >> record[i] ;
}
// end of data gathering phase
for( int i = 0; i < 100; ++i )
{
    cout << "Enter data of client " << i + 1 << ": " ;
    cin >> record[i] ;
}
// end of data gathering phase

Hope you get the drift...

I don't accept change; I don't deserve to live.

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Join Date: Nov 2006

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DanielSmith DanielSmith is offline

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Newbie Poster

Re: Creating an OS

#47

Nov 3rd, 2006

assembly language is necessary,i think. Creating an OS is not a easy job, the first thing you need to do is getting the source code of the existing OS and read it.