CPP Sample Questions Answers

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

#include

#include

#include

using namespace std;

templatestruct Out {

ostream & out;

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

void operator()(const T & val ) {

out<

}

};

struct Sequence {

int start;

Sequence(int start):start(start){}

int operator()() { return start++; }

};

struct Odd { bool operator()(int v) { return v%2==0; }};

int main() {

vector v1(10);

generate(v1.begin(), v1.end(), Sequence(1));

partition(v1.begin(),v1.end(), Odd());

for_each(v1.begin(), v1.end(), Out(cout) );cout<

return 0;

}

Choose all possible outputs:

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;

}

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

#include

using namespace std;

int main()

{

cout.setf(ios::oct, ios::basefield);

cout<<100<<" ";

cout.setf(ios::showbase);

cout<<100<<" ";

return 0;

}

Program outputs:

Which sentence is correct about the code below?

#include

#include

#include

using namespace std;

class A {

int a;

public:

A(int a) : a(a) {}

int getA() const { return a; }

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

/* Insert Code Here */

};

struct add10 { void operator()(A & a) { a.setA(a.getA() + 10); } };

int main() {

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

vector v1(t, t + 10);

for_each(v1.begin(), v1.end(), add10());

vector::iterator it = find(v1.begin(), v1.end(), A(7));

cout << it?>getA() << endl;

return 0;

}

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

#include

#include

#include

using namespace std;

int main () {

int t[] = {1,2,3,4,5,1,2,3,4,5};

vector v (t,t+10);

vector::iterator it;

int m1[] = {1, 2, 3};

it = search (v.begin(), v.end(), m1, m1+3);

cout << "found at position: " << it?v.begin() << endl;

return 0;

}

Program outputs:

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

#include

#include

#include

using namespace std;

int main(){

int t[] ={ 3, 4, 2, 1, 6, 5, 7, 9, 8, 0 };

vectorv(t, t+10);

multiset s1(v.begin(),v.end());

s1.insert(v.begin(),v.end());

pair::iterator,multiset::iterator> range;

range = s1.equal_range(6);

while (range.first != range.second) {

cout<<*range.first<<" "; range.first++;

}

return 0;

}

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

#include

#include

#include

using namespace std;

class B { int val;

public:

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

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() {

B t1[]={3,2,4,1,5};

B t2[]={5,6,8,2,1};

vector v1(10,0);

sort(t1, t1+5);

sort(t2, t2+5);

set_intersection(t1,t1+5,t2,t2+5,v1.begin());

for_each(v1.begin(), v1.end(), Out(cout));cout<

return 0;

}

Program outputs: