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 <vector>
using namespace std;
int main () {
int t[] = {1,2,3,4,5,1,2,3,5,4};
vector<int> v (t,t+10);
vector<int>::iterator it;
int m1[] = {1, 3, 2};
it = find_end (v.begin(), v.end(), m1, m1+3);
if (it != v.end())
cout << "Found at position: " << it?v.begin() << endl;
return 0;
}
A. program outputs: Found at position: 10
B. no output
C. program outputs: Found at position: 0
D. program outputs: Found at position: 5
正解：B

質問 2：
What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int main ()
{
float f1 = 10.0;
float f2 = 10.123;
cout<<noshowpoint<<f1<<" "<<f2;
return 0;
}
Program outputs:
A. compilation error
B. 10 10.123
C. 10 10
D. 10.0 10.123
正解：B

質問 3：
What happens when you attempt to compile and run the following code?
# include <iostream>
# include <set>
# include <vector>
using namespace std;
int main(){
int t[] ={ 3, 4, 2, 1, 6, 5, 7, 9, 8, 0 };
multiset<int> s1(t,t+10);
s1.insert(s1.find(7), 3);
for(multiset<int>::iterator i=s1.begin();i!= s1.end(); i++) {
cout<<*i<<" ";
}
return 0;
}
A. program outputs: 0 1 2 3 4 5 6 3 7 8 9
B. program outputs: 0 1 2 3 3 4 5 6 7 8 9
C. runtime exception
D. program outputs: 0 1 2 3 4 5 6 7 8 9
E. program outputs: 0 1 2 3 4 5 6 7 3 8 9
正解：B

質問 4：
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(10,0);
sort(t1, t1+5); sort(t2, t2+5);
copy(t1,t1+5,v1.begin());
copy(t2,t2+5,v1.begin()+5);
inplace_merge(v1.begin(), v1.begin()+5,v1.end());
for_each(v1.begin(), v1.end(), Out<B>(cout));cout<<endl;
return 0;
}
Program outputs:
A. 1 2 3 4 5 6 7 8 9 10
B. 3 2 4 1 5 6 10 8 7 9
C. compilation error
D. 1 2 3 4 5 6 10 8 7 9
E. 3 2 4 1 5 6 7 8 9 10
正解：A

質問 5：
What happens when you attempt to compile and run the following code? Choose all that apply.
# include <iostream>
# include <fstream>
# include <string>
# include <list>
# include <algorithm>
# include <iomanip>
using namespace std;
class B { int val;
public:
B(int v=0):val(v){}
int getV() const {return val;}
operator int() const { return val; };};
template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator() (const T & val ) {out<<setw(3)<<hex<<val; } };
int main () {
int t[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
fstream f("test.out", ios::trunc|ios::out);
list<B> l(t, t+10);
for_each(l.begin(), l.end(), Out<B>(f));
f.close();
f.open("test.out");
for( ; f.good() ; ) {
int i;
f>>i;
cout<<i<<" ";
}
f.close();
return 0;
}
A. no file will be created nor opened
B. file test.out will be truncated
C. file test.out will be opened writing
D. program will display sequence 1 2 3 4 5 6 7 8 9 10
E. file test.out will be opened for reading
正解：B,C,D,E

質問 6：
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[] = {1,2,3,2,3,5,1,2,7,3,2,1,10, 4,4,5};
vector<int> v (t,t+15);
vector<int>::iterator it = search_n(v.begin(), v.end(), 4, 2);
cout<< it?v.begin()<<endl;
return 0;
}
Program outputs:
A. compilation error
B. 1
C. 3
D. 10
E. 15
正解：E