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My first c++ program :>
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NINTENDO
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PostPosted: Sat Sep 11, 2010 9:41 am    Post subject: My first c++ program :> Reply with quote
This is my first awesome program in c++ Smile

All it really does is neasting a loop inside a loop to print the multiplication table.

Code:

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    for(int i=0;i<=12;i++)
    {
       cout<<i<<"\n";
           
       for(int ii=0;ii<=12;ii++)
       {
          cout<<i<<"*"<<ii<<"="<<i*ii<<"\n";     
       }
    }
   
    system("PAUSE");
    return 0;
}

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NoMercy
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PostPosted: Sat Sep 11, 2010 11:08 am    Post subject: Reply with quote
First of all: System() things are bad, you could better use, getchar or things like that.

Secondly, nice, but what can we do with it?
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NINTENDO
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PostPosted: Sat Sep 11, 2010 12:18 pm    Post subject: Reply with quote
NoMercy wrote:
First of all: System() things are bad, you could better use, getchar or things like that.

Secondly, nice, but what can we do with it?


You can use it to print a multiplication table mr obvious.
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NoMercy
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PostPosted: Sat Sep 11, 2010 12:47 pm    Post subject: Reply with quote
NINTENDO wrote:
NoMercy wrote:
First of all: System() things are bad, you could better use, getchar or things like that.

Secondly, nice, but what can we do with it?


You can use it to print a multiplication table mr obvious.


It was not to be mean, it was just a question, since i think everyone at this forum can make that up....

Also, this is not the binary section, this is for questions and such....

mr
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TROLOLOLOLOLOLOLOLOLOLOLO
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PostPosted: Sat Sep 11, 2010 12:48 pm    Post subject: Reply with quote
I would do:

Code:
#include <istream>

int main(int argc, char *argv[])
{
    for(int i=0; i<=12; i++)
    {
       printf("%d\n", i);
           
       for(int ii=0; ii<=12; ii++)
       {
          printf("%d * %d = %d\n", i, ii, (i * ii));     
       }
    }
   
    std::cin.get();
    return 0;
}
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NINTENDO
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PostPosted: Sat Sep 11, 2010 3:18 pm    Post subject: Reply with quote
CometJack wrote:
I would do:

Code:
#include <istream>

int main(int argc, char *argv[])
{
    for(int i=0; i<=12; i++)
    {
       printf("%d\n", i);
           
       for(int ii=0; ii<=12; ii++)
       {
          printf("%d * %d = %d\n", i, ii, (i * ii));     
       }
    }
   
    std::cin.get();
    return 0;
}


Ye it looks neater and runs faster I think.
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AhMunRa
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PostPosted: Sat Sep 11, 2010 7:20 pm    Post subject: Reply with quote
Wow. Showing your skills fellas. I'm surprised no one caught it.
Code:

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    long close;
    for(int i=0;i<=12;i++)
    {
       cout<<i<<"\n";
           
       for(int ii=0;ii<=12;ii++)
       {
          cout<<i<<"*"<<ii<<"="<<i*ii<<"\n";     
       }
    }
   
    //system("PAUSE");
    cin>>close;
    return 0;
}


printf is not faster than cout in every case, depends on the compiler.
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TROLOLOLOLOLOLOLOLOLOLOLO
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PostPosted: Sat Sep 11, 2010 9:01 pm    Post subject: Reply with quote
AhMunRa wrote:
Wow. Showing your skills fellas. I'm surprised no one caught it.
Code:

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    long close;
    for(int i=0;i<=12;i++)
    {
       cout<<i<<"\n";
           
       for(int ii=0;ii<=12;ii++)
       {
          cout<<i<<"*"<<ii<<"="<<i*ii<<"\n";     
       }
    }
   
    //system("PAUSE");
    cin>>close;
    return 0;
}


printf is not faster than cout in every case, depends on the compiler.


What didn't I catch?

I've also never seen "cin>>close;"; What does that do?
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hcavolsdsadgadsg
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PostPosted: Sat Sep 11, 2010 10:31 pm    Post subject: Reply with quote
AhMunRa wrote:
printf is not faster than cout in every case, depends on the compiler.


you have bigger problems at hand than printf or cout if speed is an issue.
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hcavolsdsadgadsg
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PostPosted: Sat Sep 11, 2010 10:31 pm    Post subject: Reply with quote
CometJack wrote:
I've also never seen "cin>>close;"; What does that do?


close was variable, he just uses a dud cin to wait for a keystroke.
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TROLOLOLOLOLOLOLOLOLOLOLO
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PostPosted: Sat Sep 11, 2010 11:11 pm    Post subject: Reply with quote
slovach wrote:
CometJack wrote:
I've also never seen "cin>>close;"; What does that do?


close was variable, he just uses a dud cin to wait for a keystroke.


Oh I didn't see "long close;" xD

Is that more efficient than std::cin.get(); ?
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AhMunRa
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PostPosted: Sat Sep 11, 2010 11:23 pm    Post subject: Reply with quote
In this case not really. It's the same thing.

If you already found this site disregard, if you haven't then it may be useful to you. This site used to have a lot of good programming challenges, you could write a program submit it to the forum for peer review.

http://www.cplusplus.com/

Very good for beginner.
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Flyte
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PostPosted: Sat Sep 11, 2010 11:34 pm    Post subject: Reply with quote
People seem to forget that console programs are meant to be ran from the console... they aren't really supposed to pause when they are done doing useful work.
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AhMunRa
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PostPosted: Sun Sep 12, 2010 12:08 am    Post subject: Reply with quote
People also seem to forget that most Windows users aren't used to typing out and running console apps anymore and having a screen flash without letting them see input can be infuriating to someone that doesn't know how to run a console app.

The pause is so the user may see their input or the programs output. Unless run from command line, it would be open and gone before you could read the first word.
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Flyte
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PostPosted: Sun Sep 12, 2010 12:30 am    Post subject: Reply with quote
AhMunRa wrote:
People also seem to forget that most Windows users aren't used to typing out and running console apps anymore and having a screen flash without letting them see input can be infuriating to someone that doesn't know how to run a console app.

The pause is so the user may see their input or the programs output. Unless run from command line, it would be open and gone before you could read the first word.


If you want the user to interact with the program, you make a GUI. Console programs are for back-end work and/or people who know what they are doing.

Furthermore, the way you suggested for pausing a program is flawed. If the buffer contains input when it reaches the 'cin>>close;', it will simply skip over it and close. If you must pause the program for user input, you should do the following:
Code:
std::cin.sync();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
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