3. What will be the output of each of the following program when it is executed. (a) #include using namespace std; int a = 10; namespace X { int a = 20; } namespace Y { int a = 30; } int main() { ...

3. What will be the output of each of the following program when it is executed. (a)

#include using namespace std; int a = 10; namespace X {

int a = 20;

}

namespace Y {

int a = 30;

}

int main()

{

}

(b)

++::a;

++X::a;

++Y::a;

cout <><>

cout <><>

cout <><><>

#include using namespace std; int a = 10; namespace X {

int a = 20;

}

namespace Y {

int a = 30;

}

int main()

{

}

€

cout <><>

cout <><> ‘\n’;

cout <><> ‘\n’;

return 0;

#include using namespace std; int a = 10; namespace X {

int a = 20;

}

namespace Y {

int a = 30;

}

int main()

{

}

(d)

cout <><>

cout <><> ‘\n’;

cout <><> ‘\n’;

return 0;

#include using namespace std; namespace {

int a = 20;

}

namespace {

int *ptr;

}

int main()

{

}

€

ptr = &a;

cout <><> ‘\n’; return 0;

#include using namespace std; namespace {

int a = 20;

}

namespace {

int *ptr;

}

int main()

{

}

(f)

ptr = &a;

cout <><> ‘\n’; return 0;

#include using namespace std; namespace X {

int a = 20;

}

namespace Y {

int *ptr;

}

int main()

{

}

(g)

Y::ptr = &(++X::a);

cout <><><>

#include using namespace std; namespace X {

int a; namespace Y {

int a;

}

}

int main()

{

}

(h)

X::a = 10;

Y::a = 20;

cout <><>

cout <><><>

#include using namespace std; namespace {

int a; namespace {

int b;

}

}

int main()

{

a = 10;

b = 20;

cout <><><><><><>

}