How to open a file in c++

[sam]

Sir,

I just wanted to know how will open a file in c++(Any exe file or
any other type file) and if i wanted to run that exe , How will i ?
Please provide me little idea and code of this program.

Thanks in advance

 

[newbarker]

Sir,

 I just wanted to know how will open a file in c++(Any exe file or
any other type file) and if i wanted to run that exe , How will i ?
Please provide me little idea and code of this program.

                                        Thanks in advance

Lookup the function called system(). Here's an untested example:

#include <process.h>

int main()
{
system("fred.exe");
}

Regards,

Pete

 

[Pascal J. Bourguignon]

I just wanted to know how will open a file in c++(Any exe file or
any other type file)

Using the stl::fstream:pen method.
http://www.cplusplus.com/reference/iostream/fstream/open.html

and if i wanted to run that exe , How will i ?

AFAIK, there's nothing in the stl to do that, but this can be done
using the POSIX system function.
http://www.opengroup.org/onlinepubs/009695399/functions/system.html

 

[Pascal J. Bourguignon]

Even better, use the standard C and standard C++ function
system(). Available through <stdlib.h> or, for purists, <cstdlib>.

What would be really the best? Using the standard C or C++ system
function, or using the POSIX standard system function?

I think I'd prefer to stick to the POSIX standard. Why would you
prefer the C standard?


;-)

 

[James Kanze]

What would be really the best? Using the standard C or C++
system function, or using the POSIX standard system function?

Well, the Posix standard for "system" starts by saying "The
functionality described on this reference page is aligned with
the ISO C standard. Any conflict between the requirements
described here and the ISO C standard is unintentional. This
volume of IEEE Std 1003.1-2001 defers to the ISO C standard."
So the C standard is the "original source".

I think I'd prefer to stick to the POSIX standard. Why would
you prefer the C standard?

In the context of this group, we prefer the C++ standard. Now
if the question had been asked in comp.unix.programming, we'd
prefer the Posix standard. Both, however, defer to the C
standard.

 

[arnuld]

Even better, use the standard C and standard C++ function system().
Available through <stdlib.h> or, for purists, <cstdlib>.

I think std::fstream:pen is much better than using system() . What other
people say ?

 

[Michael DOUBEZ]

arnuld a écrit :

I think std::fstream:pen is much better than using system() . What other
people say ?

The two functions are unrelated: fstream reads the content of the file
while system executes a command.

There is no matter of preference here, just a poor wording from the OP
and multiple answer depending on what people read