CPP 試験問題を無料オンラインアクセス

What happens when you attempt to compile and run the following code?
include <iostream>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
using namespace std;
int main() {
int t[] = { 10, 5, 9, 6, 2, 4, 7, 8, 3, 1 };
vector<int> v1(t, t + 10);
deque<int> d1(t, t + 10);
set<int> s1(t, t + 10);
cout<<find(v1.begin(), v1.end(), 6)<<" "<<find(d1.begin(), d1.end(), 6)<<"
"<<find(s1.begin(), s1.end(), 6);
return 0;
}

• A.program outputs: 3 6 5
• B.compilation error
• C.none of these
• D.program outputs: 3 3 5
• E.program outputs: 6 6 6

What happens when you attempt to compile and run the following code?
#include <set>
#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() {
int t[]={8, 10, 5, 1, 4, 6, 2, 7, 9, 3};
set<B> s1(t, t+10);
sort(s1.begin(), s1.end());
for_each(s1.begin(), s1.end(), Out<B>(cout));cout<<endl;
return 0;
}
Program outputs:

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

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_symmetric_difference(t2,t2+5,t1,t1+5,v1.begin());
for_each(v1.begin(), v1.end(), Out<B>(cout));cout<<endl;
return 0;
}
Program outputs:

• A.compilation error
• B.6 8 0 0 0 0 0 0 0 0
• C.6 8 3 4 0 0 0 0 0 0
• D.3 4 0 0 0 0 0 0 0 0
• E.3 4 6 8 0 0 0 0 0 0

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;
cin.getline(a);
cout<<a<<endl;
return 0;
}
Program will output:

• A.compilation error
• B.one
• C.one two three
• D.the result is unspecified
• E.runtime exception

What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int main()
{
cout.setf(ios::hex, ios::basefield);
cout<<100<<" ";
cout.flags(ios::showbase);
cout<<100<<" ";
return 0;
}
Program outputs:

• A.64 64
• B.compilation error
• C.64 0x64
• D.0x64 0x64
• E.64 100