How to call execute command line in C++

Question

For example, I have a script ./helloworld.sh

I would like to call it in C++, how do I do that? Which library can be used?

Answer 1

try

system("./helloworld.sh");

Answer 2

If you just want to run it (and nothing else)

system("./helloworld.sh");

If you need to get the stdin/stdout then you need to use popen()

FILE*  f = popen("./helloworld.sh","r");