Programming Forums > Application Development > C++

wannabe7 · Feb 23rd, 2008, 4:42 PM

Quote:

Originally Posted by grumpy

To explain what's happening. The code is "running". However, the program completes and terminates. The system therefore determines that the console window (which was created specifically for the purpose of running the program) to which output has been written is no longer needed, so it destroys the console window. Net effect is that the program disappears before you can see its output.

This is essentially what happens. When I compile and run the program, it quickly terminates after. I don't even get the chance to input the numbers. I am pretty sure (not 100%) that there's no error in it. It was copied exactly from a book by herbert schildt and so I can't seem to figure out what's wrong. I'll try doing some of the suggested things. Other inputs would also help.

WaltP · Feb 23rd, 2008, 5:51 PM

You don't need other 'inputs'. Stop the program as suggested with cin.get()

Sane · Feb 23rd, 2008, 6:00 PM

Quote:

Originally Posted by WaltP

You don't need other 'inputs'. Stop the program as suggested with cin.get()

Rofl...

He meant input, as in advice.
He already has cin statements in his program, that should be stopping the program flow.

It sounds like something's buggy with your compiler since no errors show for anything you write. Are you using Vista? I hear there are severe problems with Vista and Dev-C++.

lectricpharaoh · Feb 23rd, 2008, 6:11 PM

Quote:

Originally Posted by wannabe7

I am pretty sure (not 100%) that there's no error in it. It was copied exactly from a book by herbert schildt and so I can't seem to figure out what's wrong.

You should know that Schildt's materials have a reputation for inaccuracies and outright errors, such as the use of void main() in examples and what not.

In fact, there is a term for his work: bullschildt.

wannabe7 · Feb 24th, 2008, 3:56 PM

First of all, LOL. "bullschildt," I love it. Well, he's sold over a quarter-million books and he seems to be respected in the community by some people atleast. Also, I did try

(Toggle Plain Text)

 cin.get()

and that didn't work also. Lastly, my operating system is still XP SP2. thanks for the inputs (meaning help

) and I hope someone can find out why this is happening, I'm trying to all the time. Maybe it's the settings?

Ooble · Feb 24th, 2008, 4:27 PM

Methinks that code was given to you under the impression that you had a different problem to what you do have. Have you taken in Sane's advice and corrected it? What errors are you being given by your compiler/IDE?

Ancient Dragon · Feb 24th, 2008, 5:40 PM

The proglem is that when you use cin to input an integer the '\n' (Enter key) remains in the keyboard buffer, so you have to remove it or the next cin will fail. I solve this by adding cin.ignore(). after each cin. This is not a foolproof solution -- you can still break the program by typing junk characters after the number you want to enter and before hitting the Return key.

Here is a working program using Dev-C++ compiler.

 cplusplus Syntax (Toggle Plain Text) 
#include <iostream>
using namespace std;
 
int main()
{ 
     int length, width;
 
     cout << "Enter the length: ";
     cin >> length;
     cin.ignore();
 
     cout << "Enter the width: ";
     cin >> width;
     cin.ignore();
     cout << "The area is: ";
     cout << length * width;
     cin.get();
     return 0;
}
#include <iostream>
using namespace std;

int main()
{ 
     int length, width;

     cout << "Enter the length: ";
     cin >> length;
     cin.ignore();

     cout << "Enter the width: ";
     cin >> width;
     cin.ignore();
     cout << "The area is: ";
     cout << length * width;
     cin.get();
     return 0;
}

WaltP · Feb 24th, 2008, 5:51 PM

Quote:

Originally Posted by Sane

Quote:

Originally Posted by WaltP

You don't need other 'inputs'. Stop the program as suggested with cin.get()

Rofl...

1) He meant input, as in advice.

I know. He doesn't need more advice because cin.get() is what he needs to do.

Quote:

Originally Posted by Sane

2) He already has cin statements in his program, that should be stopping the program flow.

Yeah, for input. He still needs cin.get() at the end of the program. So far, as far as we can tell, nothing has changed since we have no idea what if anything has been added to his program. Let's stop guessing and wait for him to show us what he's done and what problems still exist, if any.

wannabe7 · Feb 26th, 2008, 4:10 PM

Quote:

Originally Posted by Ancient Dragon

The proglem is that when you use cin to input an integer the '\n' (Enter key) remains in the keyboard buffer, so you have to remove it or the next cin will fail. I solve this by adding cin.ignore(). after each cin. This is not a foolproof solution -- you can still break the program by typing junk characters after the number you want to enter and before hitting the Return key.

Here is a working program using Dev-C++ compiler.

 cplusplus Syntax (Toggle Plain Text) 
#include <iostream>
using namespace std;
 
int main()
{ 
     int length, width;
 
     cout << "Enter the length: ";
     cin >> length;
     cin.ignore();
 
     cout << "Enter the width: ";
     cin >> width;
     cin.ignore();
     cout << "The area is: ";
     cout << length * width;
     cin.get();
     return 0;
}
#include <iostream>
using namespace std;

int main()
{ 
     int length, width;

     cout << "Enter the length: ";
     cin >> length;
     cin.ignore();

     cout << "Enter the width: ";
     cin >> width;
     cin.ignore();
     cout << "The area is: ";
     cout << length * width;
     cin.get();
     return 0;
}

Thank you, Ancient Dragon. I will certainly try this. I have used

(Toggle Plain Text)

cin.ignore();

before, but I guess I just forgot about it.

Ancient Dragon · Feb 26th, 2008, 9:09 PM

Quote:

Originally Posted by Sane

I hear there are severe problems with Vista and Dev-C++.

Not that severe and nothing that can't be easily fixed. The only problem I've had so far is that I had to go into the tools-->compiler options-->directories tab and add the full path to all include and lib paths. I have yet to successfully compile and link a DLL, but its probably something simple too.

Feb 23rd, 2008, 5:51 PM	#12
WaltP Programmer Join Date: Oct 2007 Posts: 39 Rep Power: 0	Re: My programs aren't running...( no errors) You don't need other 'inputs'. Stop the program as suggested with cin.get() __________________ Testing 001 010 011 100....

Feb 24th, 2008, 3:56 PM	#15
wannabe7 Newbie Join Date: Dec 2007 Posts: 16 Rep Power: 0	Re: My programs aren't running...( no errors) First of all, LOL. "bullschildt," I love it. Well, he's sold over a quarter-million books and he seems to be respected in the community by some people atleast. Also, I did try (Toggle Plain Text) cin.get() cin.get() and that didn't work also. Lastly, my operating system is still XP SP2. thanks for the inputs (meaning help ) and I hope someone can find out why this is happening, I'm trying to all the time. Maybe it's the settings?

Feb 24th, 2008, 4:27 PM	#16
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Re: My programs aren't running...( no errors) Methinks that code was given to you under the impression that you had a different problem to what you do have. Have you taken in Sane's advice and corrected it? What errors are you being given by your compiler/IDE? __________________ Me :: You :: Them

Feb 24th, 2008, 5:40 PM	#17
Ancient Dragon PFO God In Training Join Date: Jun 2005 Location: near St Louis, MO. (USA) Posts: 547 Rep Power: 4	Re: My programs aren't running...( no errors) The proglem is that when you use cin to input an integer the '\n' (Enter key) remains in the keyboard buffer, so you have to remove it or the next cin will fail. I solve this by adding cin.ignore(). after each cin. This is not a foolproof solution -- you can still break the program by typing junk characters after the number you want to enter and before hitting the Return key. Here is a working program using Dev-C++ compiler. cplusplus Syntax (Toggle Plain Text) #include <iostream> using namespace std; int main() { int length, width; cout << "Enter the length: "; cin >> length; cin.ignore(); cout << "Enter the width: "; cin >> width; cin.ignore(); cout << "The area is: "; cout << length * width; cin.get(); return 0; } #include <iostream> using namespace std; int main() { int length, width; cout << "Enter the length: "; cin >> length; cin.ignore(); cout << "Enter the width: "; cin >> width; cin.ignore(); cout << "The area is: "; cout << length * width; cin.get(); return 0; } __________________ True Terror is to wake up one morning and discover that your high school class is running the country - Kurt Vonnegut Jr.

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Programming Forums > Application Development > C++

My programs aren't running...( no errors)