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Oct 7th, 2007

Program runs but not visible

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Hi all

I am totally new to C++ and I am using the Dev C++ compiler and getting the tutorial off
http://www.cplusplus.com/doc/tutoria...structure.html
I ran the first program (code below) and it compiled fine but when I run it a box appears then dissappears so quickly I dont have time to see what it is but by the black colour I assume its DOS, can anyone tell me why it is doing this please as I don't know if my program is working correctly and I tried the other examples and the same happens, am I doing something wrong is that why it dissappears so quickly?

C++ Syntax (Toggle Plain Text)
/ my first program in C++
 
#include <iostream>
using namespace std;
 
int main ()
{
  cout << "Hello World!";
  return 0;
}
/ my first program in C++

#include <iostream>
using namespace std;

int main ()
{
  cout << "Hello World!";
  return 0;
}

Many thanks

HLA91

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HLA91

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Oct 7th, 2007

Re: Program runs but not visible

You need to put a cin.get(); before the return 0;

Also the black window is commonly referred to as ze console window

Last edited by iamthwee; Oct 7th, 2007 at 3:19 pm.

iamthwee

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Oct 7th, 2007

Re: Program runs but not visible

Ok thanks it works now but why didnt the tutorial tell me that, can you recommend a good tutorial for me?

Many thanks for quick reply

HLA91

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Oct 7th, 2007

Re: Program runs but not visible

> why didnt the tutorial tell me that

Because it ain't got nowt to do with c++, or the semantics of the language anyway. It depends on whether your IDE (integrated development environment) already has a built-in option to pause the program for viewing.

Some don't, some do.

If you ran your program from the command prompt there would be no need for the cin.get();.

>a good tutorial for me
There are a few useful snippets at daniweb. Look there. But ultimately the best way to learn is to try your hand at a problem and post your queries here.

Last edited by iamthwee; Oct 7th, 2007 at 3:31 pm.

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Oct 15th, 2007

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Re: Program runs but not visible

I have come across another problem again, the code from another tutorial wont be visible

C++ Syntax (Toggle Plain Text)

// How IF Works#include <iostream>using namespace std;int main(){    cout << "Enter your age: ";    int age;    cin >> age;        if (age < 20)    cout << "You are still young!\n";    else    cout << "You are not so young anymore.\n";    }

I did try placing cin.get(); before the closing bracket but that didn't work and I also added return 0; incase that helped but nope. Also I cant execute the programs on my laptop running windows Me when I type IF.exe when im in the folder it says syntax error is there something different with the DOS? Many thanks HLA91

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Oct 15th, 2007

Re: Program runs but not visible

Unbelievable. 75 posts and you still don't know how to format your code ! I certainly hope you do not plan to turn in that to your instructor.

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Oct 16th, 2007

Re: Program runs but not visible

What do you mean I dont know how to format my code, if you mean placing it in my post I obviously can becasue I did it in the first post of this topic all you did was comress it which to me makes it harder to read. Also I wont be handing it to my instructor becasue this is a hobby not a school subject.

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Oct 16th, 2007

Re: Program runs but not visible

Click to Expand / Collapse Quote originally posted by HLA91 ...

all you did was comress it which to me makes it harder to read. .

Nope -- we didn't do that. In the future please hit the Preview button before posting so that you can see what it looks like.

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Oct 16th, 2007

Re: Program runs but not visible

Because I'm such a sweet guy:

C++ Syntax (Toggle Plain Text)
// How IF Works
#include <iostream>
 
using namespace std;
 
int main(){    
        cout << "Enter your age: ";    
        int age;    
        cin >> age;        
        if (age < 20)    
                cout << "You are still young!\n";    
        else    
                cout << "You are not so young anymore.\n";    
 
        return 0;  //Yes I did put in 'return 0' because it's bad 
                    //practice to leave it out and yada yada yada...
}
// How IF Works
#include <iostream>

using namespace std;

int main(){    
        cout << "Enter your age: ";    
        int age;    
        cin >> age;        
        if (age < 20)    
                cout << "You are still young!\n";    
        else    
                cout << "You are not so young anymore.\n";    
        
        return 0;  //Yes I did put in 'return 0' because it's bad 
                    //practice to leave it out and yada yada yada...
}

But to help you I guess we will nead a bit more info, the code should execute properly as it is. The problem of 'not visible', is it still in the ide?

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Oct 16th, 2007

Re: Program runs but not visible

>//Yes I did put in 'return 0' because it's bad
>//practice to leave it out and yada yada yada...
You're not getting away with this one.

Explain why it's a bad practice, please.

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