non-system C function

How can I call a non-system C function f(int,char,float) from my C++ code?

 

just as from C function.

One thing c++ mangling will happen. Just define extern C.

 

// Suppose this is your c++ file code

extern "C"
{
//Include that file also where definition of f is written
f(int , char , float );
}

int main()
{
f(1, 'g', 1.1); /// No Name mangling happen
...
}