QUESTION: 113

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<<" "; } };

int main() {
int t1[]={3,2,4,1,5};
int t2[]={5,6,8,2,1};
vector<int> v1(10);
sort(t1, t1+5);
sort(t2, t2+5);
set_symmetric_difference(t1,t1+5,t2,t2+5,v1.begin());
for_each(v1.begin(), v1.end(), Out<int>(cout));cout<<endl;
return 0;
}

Program outputs:

6 8 3 4 0 0 0 0 0 0
3 4 0 0 0 0 0 0 0 0
6 8 0 0 0 0 0 0 0 0
compilation error
3 4 6 8 0 0 0 0 0 0

Answer(s): E

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QUESTION: 114

What will happen when you attempt to compile and run the code below, assuming that file test.out do not exist before the program execution?

#include <iostream>
#include <fstream>
#include <string>
#include <list>
#include <algorithm>
using namespace std;

template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator() (const T & val ) {out<<val<<" "; } };

int main (){
int t[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
fstream f("test.out");
list<int> l(t, t+10);
for_each(l.begin(), l.end(), Out<int>(f));
f.close();
return 0;
}

file test.out will be created and opened for writing
file test.out will be created and opened for reading
no file will be created nor opened
file test.out will contain sequence 1 2 3 4 5 6 7 8 9 10
compilation error

Answer(s): C

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QUESTION: 115

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

#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; }
bool operator==(const A & b) const { return a == b.a; }
};
bool compare(const A & a, const A & b) { return a == b; }
int main () {
int t[] = {1,2,3,3,5,1,2,4,4,5};
vector<A> v (t,t+10);
vector<A>::iterator it = v.begin();

while ( (it = adjacent_find (it, v.end(), compare)) != v.end()) {
cout<<it?v.begin()<<" ";it++;
}
cout<< endl;
return 0;
}

program outputs: 2 3
program outputs: 2 7
program outputs: 3 8
compilation error
program will run forever

Answer(s): B

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QUESTION: 116

Which lines of the code below contain proper instantiation of queue objects?

#include <iostream>
#include <deque>
#include <list>
#include <queue>
#include <vector>
using namespace std;

int main()
{
deque<int> mydeck;
list<int> mylist;
vector<int> myvector;
queue<int> first; // line I
queue<int> second(mydeck); // line II
queue<int> third(second); // line III
queue<int> fourth(mylist); // line IV
queue<int> fifth(myvector); // line V
return 0;
}

line I
line II
line III
line IV
line V

Answer(s): A,B,C

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