CPP : C++ Certified Professional Programmer : Part 05
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What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
#include <algorithm>
#include <functional>
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 t[]={3,2,4,1,5,10,9,7,8,6};
vector<B> v1(t,t+10);
cout<<*max_element(v1.begin(), v1.end(), greater<B>());
cout<<endl;
return 0;
}Program outputs:
- 3
- 1
- 6
- 10
- compilation error
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What will happen when you attempt to compile and run the code below, assuming that you enter the following sequence: one two three<enter>?
#include <iostream>
#include <string>
using namespace std;int main ()
{
string a;
getline(cin, a);
cout<<a<<endl;
return 0;
}Program will output:
- one
- one two three
- runtime exception
- compilation error
- the result is unspecified
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What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator()(const T & val ) { out<<val<<” “; }
};
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<int> v1(10);
vector<int> v2(10);
generate(v1.begin(), v1.end(), Sequence(1));
stable_partition(v1.begin(),v1.end(), Odd());
for_each(v1.begin(), v1.end(), Out<int>(cout) );cout<<endl;
return 0;
}Program outputs:
- 1 2 3 4 5 6 7 8 9 10
- 5 7 3 9 1 10 2 8 4 6
- 10 2 8 4 6 5 7 3 9 1
- 4 6 8 10 2 7 5 3 1 9
- 2 4 6 8 10 1 3 5 7 9
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What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int main()
{
cout.setf(ios::oct, ios::basefield);
cout<<100<<” “;
cout.setf(ios::showbase);
cout<<100<<” “;
return 0;
}Program outputs:
- 144 0144
- 144 0x64
- 0x144 0144
- 0144 100
- compilation error
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What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
#include <algorithm>using namespace std;
template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator()(const T & val ) {
out<<val<<” “;
}
};
struct Sequence {
int start;
Sequence(int start):start(start){}
int operator()() { return start++; } };
int main() {
vector<int> v1(10);
vector<int> v2(10);
generate(v1.begin(), v1.end(), Sequence(1));
random(v1.begin(),v1.end());
for_each(v1.begin(), v1.end(), Out<int>(cout) );cout<<endl;
return 0;
}Program outputs:
- 1 2 3 4 5 6 7 8 9 10
- 10 9 8 7 6 5 4 3 2 1
- 8 2 4 9 5 7 10 6 1 3
- compilation error
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What happens when you attempt to compile and run the following code?
#include <deque>
#include <iostream>
#include <algorithm>
#include <functional>
using namespace std;
template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator() (const T & val ) { out<<val<<” “; } };struct Add : public binary_function<int, int, int> {
int operator() (const int & a, const int & b) const {
return a+b;
}
};
int main() {
int t[]={1,2,3,4,5,6,7,8,9,10};
deque<int> d1(t, t+10);
deque<int> d2(10);
transform(d1.begin(), d1.end(), d2.begin(), bind2nd(Add(), 1));
for_each(d2.rbegin(), d2.rend(), Out<int>(cout));cout<<endl;
return 0;
}Program outputs:
- 1 2 3 4 5 6 7 8 9 10
- 2 3 4 5 6 7 8 9 10 11
- 10 9 8 7 6 5 4 3 2 1
- 11 10 9 8 7 6 5 4 3 2
- compilation error
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What happens when you attempt to compile and run the following code?
#include <deque>
#include <iostream>
#include <algorithm>
#include <set>
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 t[]={8, 10, 5, 1, 4, 6, 2, 7, 9, 3};
B t1[]={B(1),B(2),B(3),B(4)};
deque<B> d1(t, t+10);
set<B> s1(t, t+10);
sort(d1.begin(), d1.end());
cout<<includes(d1.begin(),d1.end(), t1,t1+4)<<” “<<includes(s1.begin(),s1.end(), t1,t1+4)
<<endl;
return 0;
}Program outputs:
- 1 1
- 1 0
- 0 1
- 0 0
- compilation error
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What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
#include <algorithm>
#include <functional>
using namespace std;
template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator() (const T & val ) { out<<val<<” “; } };struct Add {
int operator()(int a, int b) {
return a+b;
}
};
int main() {
int t[]={1,2,3,4,5,6,7,8,9,10};
vector<int> v1(t, t+10);
vector<int> v2(10);
transform(v1.begin(), v1.end(), v2.begin(), bind1st(ptr_fun (Add()), 1));
for_each(v2.rbegin(), v2.rend(), Out<int>(cout));cout<<endl;
return 0;
}Program outputs:
- 1 2 3 4 5 6 7 8 9 10
- 2 3 4 5 6 7 8 9 10 11
- 10 9 8 7 6 5 4 3 2 1
- 11 10 9 8 7 6 5 4 3 2
- compilation error
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What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
#include <algorithm>
#include <functional>
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<<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 t[]={3,2,4,1,5,6,10,8,7,9};
vector<B> v1(t, t+10);
transform(v1.begin(), v1.end(), v1.begin(), bind2nd(plus<B>(), 1));
for_each(v1.rbegin(), v1.rend(), Out<B>(cout));cout<<endl;
return 0;
}Program outputs:
- 3 2 4 1 5 6 10 8 7 9
- 4 3 5 2 6 7 11 9 8 10
- 9 7 8 10 6 5 1 4 2 3
- 10 8 9 11 7 6 2 5 3 4
- compilation error
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What happens when you attempt to compile and run the following code?
#include <deque>
#include <iostream>
#include <algorithm>
#include <functional>
using namespace std;
class B { int val;
public:
B(int v=0):val(v){}
int getV() const {return val;}
B operator +(const B &b )const { return B(val + b.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<<” “; } };
template<typename A>
struct Add : public binary_function<A, A, A> {
A operator() (const A & a, const A & b) const { return a+b; } };
int main() {
int t[]={1,2,3,4,5,6,7,8,9,10};
deque<B> d1(t, t+10);
deque<B> d2(10);
transform(d1.begin(), d1.end(), d2.begin(), bind2nd(Add<B>(), 1));
for_each(d2.rbegin(), d2.rend(), Out<B>(cout));cout<<endl;
return 0;
}Program outputs:
- 1 2 3 4 5 6 7 8 9 10
- 2 3 4 5 6 7 8 9 10 11
- 10 9 8 7 6 5 4 3 2 1
- 11 10 9 8 7 6 5 4 3 2
- compilation error
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What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
int main ()
{
std::vector<int>v1;
for(int i = 0; i<10; i++) {v1.push_back(i); }
std::vector<int> v2(v1.begin()+2, v1.end()?2);
std::vector<int>::iterator it = v2.begin();
for( ; it != v2.end(); it++) {std::cout<<*it++<<” “; }std::cout<<std::endl;
return 0;
}- compilation error
- program outputs 0 1 2 3 4 5 6 7 8 9
- program outputs 2 3 4 5 6 7
- program outputs 2 4 6
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What happens when you attempt to compile and run the following code?
#include <iostream>
#include <map>
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<int, string> m;
for (int i = 0; i < 10; i++) {
m.insert(pair<int, string>(t[i], s[i]));
}
if (m.count(3) == 2) {
m.erase(3);
}
for (map<int, string>::iterator i = m.begin(); i != m.end(); i++) {
cout << i?>first << ” “;
}
return 0;
}- program outputs: 1 2 3 4 5
- program outputs: 1 2 4 5
- program outputs: 1 1 2 2 3 4 4 5 5
- program outputs: 1 1 2 3 3 4 4 5 5
- program outputs: one two three four five
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What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
class A {
public:
virtual int f() { return 10; }
virtual ~A(){}
};
class B: public A {
int f() {return 11; }
virtual ~B(){}
};
int main (){
std::vector<A*>v1;
for(int i = 10; i>0; i??)
{
i%2>0?v1.push_back(new A()):v1.push_back(new B());
}
std::vector<A*>::iterator it = v1.begin();
while(it != v1.end())
{
std::cout<<v1.back()?>f()<<” “;
v1.pop_back();++it;
}
return 0;
}- destructor of class A will be called
- destructor of class B will be called
- code will not compile
- program outputs 10 11 10 11 10
- program outputs 10 11 10 11 10 11 10 11 10 11
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What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;template<class A>
void f(A &a)
{
cout<<1<<endl;
}void f(int &a)
{
cout<<2<<endl;
}int main()
{
int a = 1;
f(a);
return 0;
}- program displays: 1
- program displays: 2
- compilation error
- runtime exception
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What will be output of the program when you attempt to compile and run the following code?
#include <iostream>
#include <map>
#include <vector>
#include <string>
using namespace std;
int main(){
int second[] ={ 3, 4, 2, 1, 6, 5, 7, 9, 8, 0 };
string first[] = {“three”, “four”, “two”, “one”, “six”,”five”, “seven”, “nine”,”eight”,”zero”};
multimap<int,string> m;
for(int i=0; i<10; i++) {
m.insert(pair<int,string>(second[i],first[i]));
}
m[0]=”ten”;
m.insert(pair<int,string>(1,”eleven”));
for(multimap<int, string>::iterator i=m.begin();i!= m.end(); i++) {
cout<<i?>second<<” “;
}
return 0;
}- zero one two three four five six seven eight nine
- ten one two three four five six seven eight nine
- zero eleven two three four five six seven eight nine
- ten eleven two three four five six seven eight nine
- compilation error
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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=0):val(v){}
int getV() const {return 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(5);
transform(t1,t1+5,t2,v1.rbegin(), plus<B>());
for_each(v1.rbegin(), v1.rend(), Out<int>(cout));cout<<endl;
return 0;
}Program outputs:
- 9 12 12 8 14
- 14 8 12 12 9
- 3 2 4 1 5 6 10 8 7 9
- 1 2 3 4 5 6 7 8 9 10
- compilation error
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What happens when you attempt to compile and run the following code?
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;int main () {
int t[] = {1,2,3,4,5,1,2,3,4,5};
vector<int> v (t,t+10);
vector<int>::iterator it;
int m1[] = {1, 3, 2};
it = find_first_of (v.begin(), v.end(), m1, m1+3);
cout << “First found at position: ” << it?v.begin() << endl;
return 0;
}- program outputs: First found at position: 5
- program outputs: First found at position: 0
- program outputs: First found at position: 6
- program outputs: First found at position: 1
- program outputs: First found at position: 10
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What happens when you attempt to compile and run the following code?
#include <list>
#include <iostream>
using namespace std;
template<class T>
void print(T start, T end) {
while (start != end) {
std::cout << *start << ” “; start++;
}
}
int main()
{
int t1[] ={ 1, 2, 3, 4, 5};
list<int> l1(t1, t1 + 5);
l1.remove(2);
print(l1.begin(), l1.end()); cout<<endl;
return 0;
}- program outputs: 1 2 4 5
- program outputs: 3 4 5
- program outputs: 1 3 4 5
- program outputs: 4 5
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What happens when you attempt to compile and run the following code? Choose all that apply.
#include <deque>
#include <vector>
#include <iostream>
using namespace std;
class A
{
int a;
public:
A(int a) {this?>a = a; c++;}
A(const A & a) {this?>a = a.a; c++;}
~A() { c??;}
static int c;
};
int A::c(0);
int main ()
{
A* t[] = {new A(1), new A(2), new A(3),new A(4), new A(5)};
vector<A*>v1(t, t+10);
deque<A*>d1(v1.begin(), v1.end());
d1.clear();
v1.clear();
cout<<A::c<< endl;
return 0;
}- there are 15 A objects created,
- there are 5 A objects created,
- for all object A the destructor is called
- program will display 5
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What happens when you attempt to compile and run the following code?
#include <iostream>
#include <map>
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”};
multimap<int, string> m;
for (int i = 0; i < 10; i++) {
m.push_back(pair<int, string>(t[i], s[i]));
}for (multimap<int, string>::iterator i = m.begin(); i != m.end(); i++) {
cout << i?>first << ” “;
}
return 0;
}- program outputs: 1 2 3 4 5
- compilation error
- program outputs: 1 1 2 2 3 3 4 4 5 5
- program outputs: one two three four five
- program outputs: one one two two three three four four five five
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