Системная функция Turbo C++, запускающая исполняемый файл

Вы также можете использовать функцию Turbo C++ execl(). execl() загружает и запускает C:\\TC\\BIN\\tnfsv13.exe. NULL означает, что нет аргументов для отправки tnfsv13.exe. Если возникает ошибка, execl() возвращает -1 в int c.

#include<stdio.h>
#include<process.h>

int main()
{
    int c = execl("C:\\TC\\BIN\\tnfsv13.exe", NULL);


    return 0;
}

Объяснение:

execl() loads and executes a new child process.  Because the child
process is placed in the memory currently occupied by the calling
process, there must be sufficient memory to load and execute it.

'pathname' specifies the file name of the child process.  If
'pathname' has a file name extension, then only that file is searched
for. If 'pathname' ends with a period (.), then 'pathname' without an
extension is searched for.  If that filename is not found, then
".EXE" is appended and execl() searches again.  If 'pathname' has no
extension and does not end with a period, then execl() searches for
'pathname' and, if it is not found, appends ".COM" and searches
again.  If that is not found, it appends ".EXE" and searches again.

 'arg0', 'arg1',...'argn' are passed to the child process as command-
line parameters.  A NULL pointer must follow 'argn' to terminate the
list of arguments. 'arg0' must not be NULL, and is usually set to
'pathname'.

The combined length of all the strings forming the argument list
passed to the child process must not exceed 128 bytes.  This includes
"n" (for 0-n arguments) space characters (required to separate the
arguments) but does not include the null ('\0') terminating
character.

   Returns:     If execl() is successful, it does not return to the
                calling process. (See the spawn...() routines for a
                similar function that can return to the calling
                process). If an error occurs, execl() returns -1 to
                the calling process. On error, 'errno' (defined in
                <errno.h>) is set to one of the following values
                (defined in <errno.h>):

                E2BIG       Argument list or environment list too big.
                              (List > 128 bytes, or environment > 32k)
                EACCES      Locking or sharing violation on file.
                              (MS-DOS 3.0 and later)
                EMFILE      Too many files open.
                ENOENT      File or path not found.
                ENOEXEC     File not executable.
                ENOMEM      Not enough memory.

     Notes:     Any file open when an exec call is made remains open
                in the child process.  This includes
                'stdin','stdout', 'stderr', 'stdaux', and 'stdprn'.

                The child process acquires the environment of the
                calling process.

                execl() does not preserve the translation modes of
                open files.  Use setmode() in the child process to
                set the desired translation modes.

                See the spawn...() routines for similar though more
                flexible functions that can return to the calling
                program.

   Caution:     The file pointers to open buffered files are not
                always preserved correctly.  The information in the
                buffer may be lost.

                Signal settings are not preserved.  They are reset to
                the default in the child process.

-------------------------------- Пример ----------------- ----------------

The following statements transfer execution to the child process
"child.exe" and pass it the three arguments "child", "arg1",
and"arg2":

       #include <process.h>    /* for 'execl' */
       #include <stdio.h>      /* for 'printf' and 'NULL' */
       #include <errno.h>      /* for 'errno', 'ENOENT' and 'ENOMEM' */

       main()
       {
           execl("child.exe", "child", "arg1", "arg2", NULL);
           /* only get here on an exec error */
           if (errno == ENOENT)
               printf("child.exe not found in current directory\n");
           else if (errno == ENOMEM)
               printf("not enough memory to execute child.exe\n");
           else
               printf("  error #%d trying to exec child.exe\n", errno);
       }

system() работает нормально, хотя может работать не совсем так, как вы ожидаете: он делает то же самое, что и ввод команды в командной строке MSDOS (или Win32), включая ввод и вывод, подключенные к консоли.

Если вы хотите просто запустить программу, передать параметры, а не возвращаться из нее, используйте удобную форму из семейства функций exec(). См. это для одного примера.