How to execute calculative prognam for dos?

Dear Sir:

    Three months ago,I wrote three prognams with
TC,suppose their names:a.exe,b.exe,c.exe;now,
I desire  write a menu in vc5 so that I can contract
the three prognams,but, when I use the function "system()",It don't display any result. I think You can help me to solve this difficulty.Thank You!
ps:at best,use a SDI prognam.
                             Youngest
youngestAsked:
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chensuConnect With a Mentor Commented:
Use CreateProcess, WinExec or ShellExecute to execute them.
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youngestAuthor Commented:
Can you explain clearly?

       Thank You!
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chensuCommented:
Instead of using system("a.exe"), use for example

1.
STARTUPINFO StartupInfo =
{
    sizeof(STARTUPINFO),
    NULL,
    NULL,
    NULL,
    0, 0,
    0, 0,
    0, 0,
    0,
    STARTF_USESHOWWINDOW,
    SW_SHOW,
    0,
    NULL,
    NULL,
    NULL,
    NULL
};

PROCESS_INFORMATION ProcessInformation;

if (!::CreateProcess(NULL,
                     _T("a.exe"),
                     NULL,
                     NULL,
                     TRUE,
                     0,
                     NULL,
                     NULL,
                     &StartupInfo,
                     &ProcessInformation))
{
    LPVOID lpMsgBuf;
    ::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
                    FORMAT_MESSAGE_FROM_SYSTEM,
                    NULL,
                    ::GetLastError(),
                    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                    (LPTSTR)&lpMsgBuf,
                    0,
                    NULL);
   
    // Display the string.
    ::AfxMessageBox((LPCTSTR)lpMsgBuf);
   
    // Free the buffer.
    ::LocalFree(lpMsgBuf);
}

2. ::WinExec("a.exe", SW_SHOW);

3. ::ShellExecute(hWnd, NULL, _T("a.exe"), NULL, NULL, SW_SHOWNORMAL);
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nietodCommented:
Note that this program you are creating in VC will have to be a windows program.  VC5 does not create DOS programs.  (you can create a windows console program, which is in many ways similar to a DOS program.)
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chensuCommented:
nietod,

youngest told us "Three months ago,I wrote three prognams with
TC". By TC, he meant Turbo C, I guess. He is using Visual C++ to write a Windows program which executes those DOS programs.
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nietodCommented:
yeah, I realized that the DOS programs were written in turbo debugger.   But I was wondering if he might also want this progran to be a DOS program, since (1) the others are and (2) I recall him asking questions about windows programs before.   Probably not, but I just thought it might be helpful.  (I have seen questions like.  I just spent $$ on VC and can't get it to compie my DOS program....)
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youngestAuthor Commented:
Thank  You for help,despite I can't understand it.
Because I just learn VC++.I plan to write a pop-up
menu,I can choose the item to execute my prognam,
at best,I desire display the results  in SDI,and can print
it .
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chensuCommented:
You can use the code I provided directly. Just change the program file name (a.exe).
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