Posting links to external sites just to read a bit of code is poor form.
This thread becomes meaningless if your URL vanishes.
main.cpp
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#include <iostream>
extern"C" {
void f();
}
void func(void)
{
std::cout<<"\n being used within C++ code\n";
}
int main(void)
{
f();
func();
return 0;
}