Calling a c program from another c program

Replace it with fgets and use that instead. Get rid of void main and replace it with int main void and return 0 at the end of the function. Get rid of conio. Don't cast the return value of malloc, even if you always always always make sure that stdlib. There's FAQ on this Cprogramming. Board Rules Blog. Originally Posted by Fordy. Replies: 6 Last Post: , PM. It only takes a minute to sign up.

Connect and share knowledge within a single location that is structured and easy to search. What I'm wondering is how running programs communicate with each other, and if someone could post some sample code for how to do this, so I can try it out myself, just for educational purposes.

For example, I've worked with databases before, and in my code I always have to "establish a connection to the database. What exactly is going on with that connection and how does it work? Any sort of communication with the outside world is ultimately mediated by the operating system. There's various mechanisms available for Inter-process communication , but pipes and network sockets are probably some of the most common. If you've ever piped the output of one program into another on a command line shell, those processes were communicating with a pipe.

The connection to the database you mentioned is using a network socket, perhaps with a custom protocol. For communicating separate machines in a fairly universal way, you'd probably go with a web service , which generally means passing information through HTTP and possibly XML. However, for the case of other programs, it depends a lot. If it's just a module written in the same language, you could just import. If it's a Unix process, you could call system function passing the command. If you want something to be multi-platform, you could use a Restful or a SOAP web service that'd require internet connection , and so on.

To ensure that the database service is running , You can either check whether the service is running, and start or stop it accordingly. Suppose we want to run the program "hello. It's executing only the printf statements but it not executing the block which are inside system Is there any header i need to include???? HI Gaurav, this is also not working.. Only the printf statements are working See more: C. Hi, How to call a c program from another. Can someone tell me on this? Posted Dec pm venkat28vk.

Add a Solution. Sergey Alexandrovich Kryukov Dec am. There is no such concept, "call a program". You can start a process. It does not matter if that is a C application or not. The answer depends on your platform.

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