Mega Code Archive
Class forward declaration
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#include <iostream>
using namespace std;
class pr2; //
class pr1 {
int printing;
public:
pr1() {
printing = 0;
}
void set_print(int status) {
printing = status;
}
friend int inuse(pr1 object1, pr2 object2);
};
class pr2 {
int printing;
public:
pr2() {
printing = 0;
}
void set_print(int status) {
printing = status;
}
friend int inuse(pr1 object1, pr2 object2);
};
int inuse(pr1 object1, pr2 object2)
{
if(object1.printing || object2.printing) return 1;
else return 0;
}
int main()
{
pr1 p1;
pr2 p2;
if(!inuse(p1, p2))
cout << "Printer idle\n";
cout << "Setting p1 to printing...\n";
p1.set_print(1);
if(inuse(p1, p2))
cout << "Now, printer in use.\n";
cout << "Turn off p1...\n";
p1.set_print(0);
if(!inuse(p1, p2))
cout << "Printer idle\n";
cout << "Turn on p2...\n";
p2.set_print(1);
if(inuse(p1, p2))
cout << "Now, printer in use.\n";
return 0;
}
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