HP SunSoft Pascal 4.0 - Manual (Page 179)

The C++–Pascal Interface 155
7
Procedure Calls: Pascal–C++
A Pascal main program can also call C++ functions. The following examples
show you how to pass simple types and arguments and include the commands
that are used to compile and execute the final programs.
Arguments Passed by Reference
Pascal arguments can be passed by reference. Here we discuss how they work
with C++.
The C++ main program,
IOMain.cc
#include <stdio.h>
extern "C" {
void IO ();
};
int main(void)
{
IO ();
printf ("Hello, C++ ! \n");
}
The commands to compile and
execute
IO.p and IOMain.cc
hostname% pc -c IO.p
hostname% CC IO.o IOMain.cc -lpc
hostname% a.out
Hello, Pascal & St.Petersburg !
Hello, C++ !