Free C++ Institute CPP Exam Practice Questions & Explanations

Last updated on: Nov 1, 2026
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Question 1

What will happen when you attempt to compile and run the code below, assuming that you enter the following sequence: one two three?

#include

#include

using namespace std;

int main ()

{

string a;

cin.getline(a);

cout<

return 0;

}

Program will output:

Answer Options
Correct Answer: D
Question 2

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.push_back(pair(t[i], s[i]));

}

for (map::iterator i = m.begin(); i != m.end(); i++) {

cout << i?>first << " ";

}

return 0;

}

Answer Options
Correct Answer: B
Question 3

Which changes, introduced independently, will allow the code to compile and display ''one'' ''eight''

''nine'' ''ten''? Choose all that apply

#include

#include

#include

using namespace std;

class A {

int a;

public:

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

int getA() const { return a;}

/* Insert Code Here 1 */

};

/* Insert Code Here 2 */

int main(){

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

string s[] = {"three", "four", "two", "one", "six","five", "seven", "nine","eight","ten"};

map m;/* Replace Code Here 3 */

for(int i=0; i<10; i++) {

m.insert(pair(A(t[i]),s[i]));

}

m.erase(m.lower_bound(2),m.upper_bound(7));

map::iterator i=m.begin(); /* Replace Code Here 4 */

for( ;i!= m.end(); i++) {

cout<second<<" ";

}

cout<

return 0;

}

Answer Options
Correct Answer: A, B, 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<

struct Sequence {

int start;

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

int operator()() {

return start++; } };

int main() {

vector v1(10);

vector v2(10);

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

reverse_copy(v1.begin(),v1.end(), v2.rbegin());

sort(v2.begin(), v2.end(), less_equal());

for_each(v2.begin(), v2.end(), Out(cout) );cout<

return 0;

}

Program outputs:

Answer Options
Correct Answer: A
Question 5

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

#include

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

int t2[]={1,2,3,4,5,6,7,8,9,10};

vector v1(t1, t1+10);

vector v2(t2, t2+10);

vector v3(10);

transform(v1.begin(), v1.end(), v2.rbegin(), v3.begin(), minus());

for_each(v3.rbegin(), v3.rend(), Out(cout));cout<

return 0;

}

Program outputs:

Answer Options
Correct Answer: A