C Institute CPP Exam Practice Test Instant Access

Question 1

What happens when you attempt to compile and run the following code?

#include

using namespace std;

template

class A {

T_v;

public:

A() {}

A(T v): _v(v){}

T getV() { return _v; }

void add(T & a);

void add(string & a);

};

template

void A::add(T & a) { _v+=a; }

void A::add(string & a) {

_v.insert(0, a);

}

int main()

{

Aa("Hello");

string s(" world!");

a.add(s);

cout << a.getV() <

return 0;

}

Aprogram will display: Hello world!

Bcompilation error

Cprogram will display: world!Hello

Dprogram will run without any output

Answer : B

Question 2

What happens when you attempt to compile and run the following code?

#include

using namespace std;

int main()

{

deque mydeck;list mylist; vector myvector;

queue first; queue second(mydeck);

queue third(second); queue > fourth(mylist);

fourth.push(10);fourth.push(11);fourth.push(12);

queue > fifth(myvector);

fifth.push(10);fifth.push(11);fifth.push(12); // Line I

while(!fifth.empty())

{

cout<

fifth.pop(); // Line III

}

while (!fourth.empty())

{

cout << fourth.front() << " ";

fourth.pop(); // Line IV

}

return 0;

}

Aprogram outputs: 10 11 12 10 11 12

Bcompilation error in line I

Ccompilation error in line II

Dcompilation error in line III

Ecompilation error in line IV

Answer : D

Question 3

What happens when you attempt to compile and run the following code?

#include

using namespace std;

class A

{

int a;

public:

A():a(0){} A(int a){ this?>a = a;}

void setA(int a) {this?>a = a;}

int getA() {return a;}

};

ostream &operator<<(ostream & cout, A & a)

{

cout<< a.getA();

return cout;

}

int main ()

{

vectorv(5, new A());

v.push_back(new A(1));

vector::iterator it;

for(it = v.begin(); it != v.end(); it++)

{

cout<<*it<<" ";

}

cout<

return 0;

}

Aprogram outputs 0 0 0 0 0 1

Bprogram outputs 0 0 0 0 0 0

Ccompilation error

Dprogram outputs 1 1 1 1 1 1

Enone of these

Answer : E

Question 4

What happens when you attempt to compile and run the following code?

#include

using namespace std;

class B { int val;

public:

B(int v):val(v){} B(){}

int getV() const {return val;} bool operator > (const B & v) const { return val>v.val;} };

ostream & operator <<(ostream & out, const B & v) { out<

templatestruct Out {

ostream & out;

Out(ostream & o): out(o){}

void operator() (const T & val ) { out<

int main() {

int t[]={8, 10, 5, 1, 4, 6, 2, 7, 9, 3};

deque d1(t, t+10);

sort(d1.begin(), d1.end(), greater());

deque::iterator it = lower_bound(d1.begin(), d1.end(), 4,greater());

for_each(it, d1.end(), Out(cout));cout<

return 0;

}

Program outputs:

A4 3 2 1

B3 2 1

C5 4 3 2 1

Dcompilation error

E1 2 3 4

Answer : A

Question 5

What happens when you attempt to compile and run the following code?
#include
#include
int main ()
{
std::vectorv1;
for(int i = 0; i<10; i++) {v1.push_back(i); }
std::vector v2(v1.begin()+2, v1.end()?2);
std::vector::iterator it = v2.begin();
for( ; it != v2.end(); it++) {std::cout<<*it++<<" "; }std::cout<
return 0;
}

Acompilation error

Bprogram outputs 0 1 2 3 4 5 6 7 8 9

Cprogram outputs 2 3 4 5 6 7

Dprogram outputs 2 4 6

Answer : D

Question 6

What happens when you attempt to compile and run the following code?
#include
#include
using namespace std;
int main() {
int t[] = { 1, 1, 2, 2, 3, 3, 4, 4, 5, 5 };
string s[] = { "one", "one", "two", "two", "three","three", "four", "four", "five", "five"};
map m;
for (int i = 0; i < 10; i++) {
m.insert(pair(t[i], s[i]));
}
if (m.count(3) == 2) {
m.erase(3);
}
for (map::iterator i = m.begin(); i != m.end(); i++) {
cout << i?>first << " ";
}
return 0;
}

Aprogram outputs: 1 2 3 4 5

Bprogram outputs: 1 2 4 5

Cprogram outputs: 1 1 2 2 3 4 4 5 5

Dprogram outputs: 1 1 2 3 3 4 4 5 5

Eprogram outputs: one two three four five

Answer : A

Question 7

What happens when you attempt to compile and run the following code?
#include
#include
class A {
public:
virtual int f() { return 10; }
virtual ~A(){}
};
class B: public A {
int f() {return 11; }
virtual ~B(){}
};
int main (){
std::vectorv1;
for(int i = 10; i>0; i??)
{
i%2>0?v1.push_back(new A()):v1.push_back(new B());
}
std::vector::iterator it = v1.begin();
while(it != v1.end())
{
std::cout<f()<<" ";
v1.pop_back();++it;
}
return 0;
}

Adestructor of class A will be called

Bdestructor of class B will be called

Ccode will not compile

Dprogram outputs 10 11 10 11 10

Eprogram outputs 10 11 10 11 10 11 10 11 10 11

Answer : D

C++ Institute CPP - C++ Certified Professional Programmer Exam Practice Test