command line

This is a discussion on command line within the C++ Programming forums, part of the General Programming Boards category; how to run C++ code in command line ? compiler : DEV-CPP...

  1. #1
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    command line

    how to run C++ code in command line ?

    compiler : DEV-CPP

  2. #2
    Supermassive black hole cboard_member's Avatar
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    Do you mean you want to compile it at the command line or create a command line program?
    Good class architecture is not like a Swiss Army Knife; it should be more like a well balanced throwing knife.

    - Mike McShaffry

  3. #3
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    yes, i want to compile and run in command line. i dont want to use IDE.

    my compiler is DEV-CPP

  4. #4
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    Hello, I think there's a little confusion: devcpp is not a compiler, is an IDE; by default devcpp uses MingW to compile, so you can have a look at www.mingw.org in the section 'Documentation', subsection 'Compiling and building with...', where you will find the easy ways to doing it, different synthax to compile C, C++, outputs and other stuff.
    Sorry to not post a sample way to do it, but I always use the IDE
    Niara

  5. #5
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    Thanks for the information.

    anybody here compile and run in command line . please give me a sample

  6. #6
    Registered User Frobozz's Avatar
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    Quote Originally Posted by Stream
    Thanks for the information.

    anybody here compile and run in command line . please give me a sample
    Meh. Not too difficult.

    Code:
    g++ blah.cpp -o blah.exe
    Using a library (OpenGL for example):

    Code:
    g++ blah.cpp -lopengl32 -o blah.exe

  7. #7
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    DevC++ uses gcc (MinGW) for compiling, so it should already be installed on your system. Just add it to your PATH or cd to the dir it's in (C:\devcpp\bin?) and run it.

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    hi, i have added C:\Dev-Cpp\bin in my PATH variable.

    after that how do i compile and run my cpp code ? my code is here c:\myfolder\Prog.cpp

    please tell me the syntax of compile and run command line instructions.

    Regards

  9. #9
    and the hat of wrongness Salem's Avatar
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    Well at your command prompt, type

    g++ prog.cpp

    That should get you an exe file (prog.exe or a.exe say), which you then just run like you would any other program.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  10. #10
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    Well at your command prompt, type
    g++ prog.cpp
    ok.
    i did

    Code:
    C:\>g++ prog.cpp
    
    C:\>

    so, it compiled fine. but did not get a prog.exe in c:\.......rather i get a a.exe file !

    and when i clicked a.exe....command prompt blinked away ...i could see nothing.


    so,

    Q1. how can i run the code (a.exe )?

    Q2. i dont like my exe's name to be a.exe.........can not i get it with the name prog.exe ?

  11. #11
    Nonconformist Narf's Avatar
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    Q1. how can i run the code (a.exe )?
    The same way you call any other executable. If you click the icon then a process is spawned and and console window created for the program to run in. When the program is done, the process is destroyed and the window along with it. To keep the window open, you need to keep the program running. The most common way to do that is a blocking read:
    Code:
    #include <iostream>
    #include <limits>
    
    using namespace std;
    
    int main() {
      // Your program here
    
      // Discard leftover characters in the stream
      cin.ignore(numeric_limits<streamsize>::max(), '\n');
      // (Hopefully) blocking read
      cin.get();
    
      return 0;
    }
    Alternatively, you can run the program from the command line. That way the process and window belong to the command prompt, not the program, so it isn't destroyed when the program ends.
    Q2. i dont like my exe's name to be a.exe.........can not i get it with the name prog.exe ?
    a.exe is the default if you don't provide a name, just like on *nix it's a.out. You can change the name with the -o switch:
    Code:
    C:\>g++ -o prog.exe prog.cpp
    While you're at it, say -Wall and -pedantic too. Those switches help you catch bugs:
    Code:
    C:\>g++ -Wall -pedantic -o prog.exe prog.cpp
    Just because I don't care doesn't mean I don't understand.

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