Free C++ Institute CPP Exam Practice Questions & Explanations

Last updated on: Sep 16, 2026
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Question 1

What will happen 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, 6 , 7, 8 , 9, 10};

dequed1(t, t+10);

vectorv1(t, t+10);

cout<

cout<

d1.resize(12); v1.resize(12);

cout<

cout<

d1.reserve(20);v1.reserve(20);

cout<

cout<

return 0;

}

Answer Options
Correct Answer: C
Question 2

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

#include

using namespace std;

template

void g(int a)

{

cout<

}

template

void g(A a)

{

cout<

}

int main()

{

int a = 1;

g(a);

return 0;

}

Answer Options
Correct Answer: B
Question 3

Given three files: class.h, class.cpp and main.cpp containing small C++ project, which sentences are TRUE if you attempt to compile and run the program? Assume that the whole compiling environment is properly set.

// File: main.cpp

#include

#include "class.h"

using namespace std;

int main()

{

A a;

cout << a.getV() << endl;

return 0;

}

//File: class.h

#ifndef _CLASS_

#define _CLASS_

template

class A {

T_v;

public:

A() {}

A(T v);

T getV();

};

#endif

//File: class.cpp

#include "class.h"

template

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

template

T A::getV() { return _v; }

Answer Options
Correct Answer: D
Question 4

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<

int main() {

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

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

vector v1(10);

sort(t1, t1+5);

sort(t2, t2+5);

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

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

return 0;

}

Program outputs:

Answer Options
Correct Answer: D
Question 5

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

#include

#include

#include

#include

using namespace std;

class B { int val;

public:

B(int v=0):val(v){}

int getV() const {return val;}

operator int () const { return 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 t[]={3,2,4,1,5,6,10,8,7,9};

vector v1(t, t+10);

transform(v1.begin(), v1.end(), v1.begin(), bind2nd(plus(), 1));

for_each(v1.rbegin(), v1.rend(), Out(cout));cout<

return 0;

}

Program outputs:

Answer Options
Correct Answer: D