Dev- C++

Hi all,

Im having a bit of problem with Dev-C++. When i run a dos program i have to use the system("pause") command, to stop the dos screen flashing up fast and then vanishing - this was fine when my programs were simple. However now my programs are getting more complex( running command line applications), its getting a real pain using the pause command.

Therefore could somebody offer me some advice on how to change the compilers configuration options to enable me not to use the system("pause") .

Cheers

Tuurbo46

Just run your program from the command line. With the command prompt window open, you will not have this problem of "the dos screen flashing up fast and then vanishing".

Hi,

Thanks for speedy reply.

Im dont really understand how to do that, currently i do the following:

Open Dev-C++ >> open project >> run my program >> dos screen flashes up

????

Look forward to your advice.

cin.get();

Quote:

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Im dont really understand how to do that, currently i do the following:

Open Dev-C++ >> open project >> run my program >> dos screen flashes up

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1. Start -> Run -> Open cmd. The command prompt window appears.

2. Using the command prompt, navigate to your project directory.
For example,
cd C:\projects\xyz

3. Enter your program name at the command line to run the program.

If you really do not want to run your program like this (or redirect output to a file), then you have no choice but to live with system("pause") or one of the better suggestions from our FAQ.

Oh wait, our FAQ needs to be updated because Prelude pointed out that in.clear() is not guaranteed to work as expected. From what I see, you can just remove in.clear() from myflush() in the C++ example.

Quote:

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Originally Posted by tuurb046

Hi,

Thanks for speedy reply.

Im dont really understand how to do that, currently i do the following:

Open Dev-C++ >> open project >> run my program >> dos screen flashes up

????

Look forward to your advice.

---

Select "Start" menu >> "Programs" >> "Accessories" >> "Command Prompt"

In the black box that opens navigate to the directory where your exe is located using "cd" (change directory) command and type the name of your program to launch it.

You can also create a shortcut to "Command Prompt" and configure it to start from desired directory.

system("Pause") or cin.get are not very helpful if your program aborts because of an assert etc.

Hi,

Cheers for your help, i will have a go when i get home from work.

Thanks

Tuurbo46

Hi again.

I have followed your steps and i have a few questions:

1) how to i create a shortcut to the path entered on the command line?

2) is the path entered on the command line the same as creating a shortcut to the exe in the project folder (from windows desktop)?

Cheers Tuurbo46

Is there a reason you need to use Dev-C++?

Hi,

In a round about way, im a embedded c programmer and im learning dos c and c++ to improve my skill etc. After reading the cprogramming site they recommend Dev-C++ so this is what i use.

Apart from the above reason no not really, what do you recommend?

Cheers Tuurbo46

There's Visual Studio Express. Terrific IDE IMO.

hi,

visual studio c++ 2008?

http://msdn2.microsoft.com/en-us/exp.../bb421473.aspx

Its funny you should say that im actually heading towards c++.net but did not realise you could run dos in this?

Cheers

You mean CLI-type, no? A dos window within <insert favorite OS here>?
Pretty much all compilers can do that.
Yes, I mean 2008. It can do both C and C++, if you want.
Btw, I meant IDE, not GUI. It's a dev environment, debugger and compiler.

hi,

yeah:

printf("hello world"); // kinda link this

Just practicing c and c++ in a dos enviroment before i get into windows.

So downloading c++ from that link is ok?

Thanks for all your help

Tuurbo46

Sure, Express is free, so go ahead if you want.

Quote:

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Originally Posted by tuurb046

Hi again.

I have followed your steps and i have a few questions:

1) how to i create a shortcut to the path entered on the command line?

2) is the path entered on the command line the same as creating a shortcut to the exe in the project folder (from windows desktop)?

Cheers Tuurbo46

---

Make your shortcut run "cmd.exe /K c:\path\to\program.exe". The /K causes cmd to stick around after the program terminates.

Ok all im real lost now. I have an example which i run on the command line (using dev-c++), and when the program is run, the following is displayed:

Two arguments shlould be supplied
C:\Dev-Cpp\projects>

At this point i think the program should enable me to add two arguments, but it does not it expects you to put exe name in again. Can you guys and girls explain in more detail? I have added the code below so you can have a look.

Code:

---


#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{

    int length, element;
    char letter = 'e';
    char *chrptr;
    if(argc != 3)
    {
            printf("%s: Two arguments shlould be supplied\n", argv[0]);
            return 1;
           
    }
    length=strlen(argv[1]);
    printf("'%s' contains %d characters\n", argv[1], length);
   
    if((strchr(argv[1], letter))!=NULL)
    {
        element = strchr(argv[1], letter) - argv[1];
        element++;
        printf("Letter '%c' is first found at character", letter);
       
        printf(" %d in string '%s'\n", element, argv[1]);
        printf("When searching forwards\n");
    }
    else
        printf("Letter '%c' not found in string '%s'\n", letter, argv[1]);
       
    if((strcmp(argv[1], argv[2]))!=0)
        printf("String '%s' and  '%s' are different\n", argv[1], argv[2]);
    else
        printf("Strings are identical\n");
    return 0;
   
}

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Quote:

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Originally Posted by tuurb046

Ok all im real lost now. I have an example which i run on the command line (using dev-c++), and when the program is run, the following is displayed:

Two arguments shlould be supplied
C:\Dev-Cpp\projects>

At this point i think the program should enable me to add two arguments, but it does not it expects you to put exe name in again. Can you guys and girls explain in more detail? I have added the code below so you can have a look.

---

Why would it enable you to add two arguments? Your program clearly terminates after that error message is printed.

If you want your program to read in two arguments when they are not provided, then you should program it to do so.

Hi,

ok i will rewind a bit, im trying to learn c with command line arguments, the above example is just a random piece of code not written by me. To date i cannot understand what is going on, the argv[0] etc is puzzleing me.

With a conventional part of c you get the following:

Code:

---

printf("please enter a letter");
scanf("%a", &a);
printf("%a is the letter you entered", a);

---

However with command line argruments, where does argv[0] and argv[1] come from?

Code:

---

if(argc != 3)
    {
            printf("%s: Two arguments shlould be supplied\n", argv[0]);
            return 1;
           
    }

---

They are arguments passed to main. They contain the command line arguments passed to your application.

Quote:

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Originally Posted by tuurb046

Code:

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printf("please enter a letter");
scanf("%a", &a);
printf("%a is the letter you entered", a);

---

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%a is for floats in scanf and doubles in printf, not characters. Use %c for that.