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 <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 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(1,Add()));
for_each(v2.rbegin(), v2.rend(), Out<int>(cout));cout<<endl;
return 0;
}
Program outputs:
A. 1 2 3 4 5 6 7 8 9 10
B. 2 3 4 5 6 7 8 9 10 11
C. 11 10 9 8 7 6 5 4 3 2
D. compilation error
E. 10 9 8 7 6 5 4 3 2 1
正解：D

質問 2：
What will happen when you attempt to compile and run the following code?
# include <iostream>
# include <string>
using namespace std;
template <class T>
class A {
T_v;
public:
A() {}
A(T v): _v(v){}
T getV() { return _v; }
void add(T & a) { _v+=a; }
};
int main()
{
A<string>a("Hello");
string s(" world!");
a.add(s);
cout << a.getV() <<endl;
return 0;
}
A. program will run without any output
B. program will display: Hello
C. program will not compile
D. program will display: Hello world!
正解：D

質問 3：
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 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(Add(),1));
for_each(v2.rbegin(), v2.rend(), Out<int>(cout));cout<<endl;
return 0;
}
Program outputs:
A. 1 2 3 4 5 6 7 8 9 10
B. 2 3 4 5 6 7 8 9 10 11
C. 11 10 9 8 7 6 5 4 3 2
D. compilation error
E. 10 9 8 7 6 5 4 3 2 1
正解：D

質問 4：
Given three files: class.h, class.cpp and main.cpp containing small C++ project, which sentences are TRUE if you attempt to compile and run the program? Assume that the whole compiling environment is properly set.
// File: main.cpp
# include <iostream>
# include "class.h"
using namespace std;
int main()
{
A<int> a;
cout << a.getV() << endl;
return 0;
}
//File: class.h
# ifndef _CLASS_
# define _CLASS_
template <class T>
class A {
T_v;
public:
A() {}
A(T v);
T getV();
};
#endif
//File: class.cpp
# include "class.h"
template<typename T>
A<T>::A(T v):_v(v) {}
template<class T>
T A<T>::getV() { return _v; }
A. program will display unpredictable number
B. program will display: 0
C. program will not compile
D. program willl be not linked
正解：D

質問 5：
What will happen when you attempt to compile and run the code below, assuming that you enter the following sequence: 64 100<enter>?
# include <iostream>
# include <string>
# include <sstream>
# include <iomanip>
using namespace std;
int main ()
{
string s;
getline(cin, s);
stringstream input(s);
stringstream output;
for( ; !input.fail() ; )
{
int i;
input>>hex>>i;
output<<setw(4)<<i;
}
cout<<output.str();
return 0;
}
What will be the result assuming that user will enter following sequence: 64 100:
A. 0x100 0x256 0x256
B. 64 100
C. 100 256 256
D. 100 256
E. 0x64 0x100
正解：C

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