CPP Exam - Free C++ Institute Questions and Answers

Question #6 (Topic: Topic 1)

What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
#include <algorithm>
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<<v.getV(); return out;}
template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator() (const T & val ) { out<<val<<" "; } };
int main() {
B t1[]={3,2,4,1,5};
B t2[]={5,6,8,2,1};
vector<B> 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<B>(cout));cout<<endl;
return 0;
}
Program outputs:

A. compilation error B. 1 2 3 4 5 6 8 0 0 0 C. 1 2 3 4 5 6 8 2 1 0 D. 5 2 1 0 0 0 0 0 0 0 E. 1 2 5 0 0 0 0 0 0 0

Answer: D

Question #7 (Topic: Topic 1)

What happens when you attempt to compile and run the following code?
#include <list>
#include <vector>
#include <iostream>
using namespace std;
int main ()
{
int t[] = {1, 2 ,3 ,4 ,5};
vector<int>v1(t, t+5);
list<int>l1;
l1.assign(v1.end(), v1.begin());
for(int i=0; i<l1.size(); i++)
{
cout<<l1.at(i)<<" ";
}
cout<<endl;
return 0;
}

A. program displays 5 4 3 2 1 B. program displays 1 2 3 4 5 C. compilation error D. segmentation fault runtime exception

Answer: C

Question #8 (Topic: Topic 1)

What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
#include <algorithm>
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<<v.getV(); return out;}
template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator() (const T & val ) { out<<val<<" "; } };
int main() {
B t1[]={3,2,4,1,5};
B t2[]={6,10,8,7,9};
vector<B> v1(10);
sort(t1, t1+5);
sort(t2, t2+5);
merge(t1,t1+5,t2,t2+5,v1.begin());
for_each(v1.begin(), v1.end(), Out<B>(cout));cout<<endl;
return 0;
}
Program outputs:

A. 1 2 3 4 5 6 10 8 7 9 B. 3 2 4 1 5 6 7 8 9 10 C. 3 2 4 1 5 6 10 8 7 9 D. 1 2 3 4 5 6 7 8 9 10 E. compilation error

Answer: E

Question #9 (Topic: Topic 1)

Which sentence is correct about the code below?
#include <iostream>
#include <algorithm>
#include <vector>
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<A> v1(t, t + 10);
for_each(v1.begin(), v1.end(), add10());
vector<A>::iterator it = find(v1.begin(), v1.end(), A(7));
cout << it?>getA() << endl;
return 0;
}

A. it will compile and print 7 B. it will not compile C. it will compile but the program result is unpredictable D. adding code: bool operator !=(const A & b) const { if (this?>a != b.a) { return true; } return false; } at Place 1 will allow the program to compile

Answer: B

Question #10 (Topic: Topic 1)

What happens when you attempt to compile and run the following code?
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
void myfunction(int i) {
cout << " " << i;
}
void multiply (int a) {
a*2;
}
int main() {
int t[] = { 10, 5, 9, 6, 2, 4, 7, 8, 3, 1 };
vector<int> v1(t, t+10);
for_each(v1.begin(), v1.end(), multiply);
iter_swap(v1.begin(),t+9);
for_each(v1.begin(), v1.end(), myfunction);
return 0;
}
Program outputs:

A. 1 5 9 6 2 4 7 8 3 1 B. compilation error C. 1 2 3 4 5 6 7 8 9 10 D. 10 9 8 7 6 5 4 3 2 1 E. 10 5 9 6 2 4 7 8 3 1

Answer: A

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