最新なC++ Institute CPP問題集（230題）、真実試験の問題を全部にカバー！

質問 1：
What happens when you attempt to compile and run the following code?
# include <iostream>
# include <algorithm>
#include <map>
using namespace std;
int main() {
int t[] = { 10, 5, 9, 6, 2, 4, 7, 8, 3, 1 };
map<int, int> m;
for(int i=0; i < 10; i++) {
m[i]=t[i];
}
map<int, int>::iterator it = find(m.begin(), m.end(), 5);
cout<<it?>first;
return 0;
}
Program outputs:
A. 4
B. 5
C. compilation error
D. 10
正解：C

質問 2：
What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
template<int>
void g(int a)
{
cout<<a?1<<endl;
}
template<class A>
void g(A a)
{
cout<<a+1<<endl;
}
int main()
{
int a = 1;
g(a);
return 0;
}
A. program displays: 2
B. compilation error
C. runtime exception
D. program displays: 1
正解：A

質問 3：
Which method added to class B at the marked spot will allow the code below to compile?
Choose all possible solutions.
# include <vector>
# include <iostream>
# include <algorithm>
using namespace std;
class B { int val;
public:
B(int v):val(v){}
int getV() const {return val;}
/* Insert Code Here */
};
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};
vector<B> v1(t, t+10);
sort(v1.begin(), v1.end(), greater<B>());
for_each(v1.begin(), v1.end(), Out<B>(cout));cout<<endl;
return 0;
}
A. bool operator < (const B & v) const { return val<v.val;}
B. bool operator == (const B & v) const { return val==v.val;}
C. operator int () const { return val; }
D. bool operator > (const B & v) const { return val<v.val;}
E. bool operator > (const B & v) const { return val>v.val;}
正解：B,D,E

質問 4：
What happens 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"}; map<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(map<int, string>::iterator i=m.begin();i!= m.end(); i++) {
cout<<i?>second<<" ";
}
return 0;
}
A. program outputs: zero one two three four five six seven eight nine
B. program outputs: ten eleven two three four five six seven eight nine
C. program outputs: ten one two three four five six seven eight nine
D. program outputs: zero eleven two three four five six seven eight nine
E. program outputs: 0 1 2 3 4 5 6 7 8 9
正解：C

質問 5：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
using namespace std;
int main() {
int t[] = {1,2,3,2,3,5,1,2,7,3,2,1,10, 4,4,5};
vector<int> v1(t, t + 15);
set<int> s1(t, t + 15);
pair<set<int>::iterator, vector<int>::iterator > resultSet = equal(s1.begin(), s1.end(), v1.begin());
cout<<*resultSet.first<<" "<<*resultSet.second<<endl;
return 0;
}
Program outputs:
A. compilation error
B. 0 5
C. 4 2
D. 2 4
正解：A

質問 6：
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:
A. compilation error
B. 3 4 6 8 0 0 0 0 0 0
C. 6 8 3 4 0 0 0 0 0 0
D. 6 8 0 0 0 0 0 0 0 0
E. 3 4 0 0 0 0 0 0 0 0
正解：B