C++ Institute CPP 問題集

質問 1：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
void myfunction(int i) {
cout << " " << i;
}
int main() {
int t[] = { 10, 5, 9, 6, 2, 4, 7, 8, 3, 1 };
vector<int> v1(t, t + 10);
copy(t, t+10, v1.end());
for_each(v1.begin(), v1.end(), myfunction);
return 0;
}
Program outputs:
A. 10 5 9 6 2 4 7 8 3 1 10 5 9 6 2 4 7 8 3 1
B. compilation error
C. runtime exception/segmentation fault
D. 10 5 9 6 2 4 7 8 3 1
正解：C

質問 2：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
using namespace std;
void myfunction(int i) {
cout << " " << i;
}
int main() {
int t[] = { 10, 5, 9, 6, 2, 4, 7, 8, 3, 1 };
set<int> s1(t, t+10);
vector<int> v1(s1.rbegin(), s1.rend());
swap(s1, v1);
for_each(v1.begin(), v1.end(), myfunction);
for_each(s1.begin(), s1.end(), myfunction);
return 0;
}
Program outputs:
A. 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10
B. compilation error
C. 10 9 8 7 6 5 4 3 2 1 10 9 8 7 6 5 4 3 2 1
D. 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
正解：B

質問 3：
What happens when you attempt to compile and run the following code?
#include <deque>
#include <iostream>
#include <algorithm>
#include <set>
using namespace std;
template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator() (const T & val ) { out<<val<<" "; }
};
bool Compare(char a, char b) { return tolower(a) < tolower(b);}
int main() {
char s[]={"qwerty"};
char t1[]={"ert"};
char t2[]={"ERT"};
sort(s, s+6);
cout<<includes(s,s+6, t1,t1+3, Compare)<<" "<<includes(s,s+6, t2,t2+3, Compare)<<endl; return 0;
}
Program outputs:
A. 1 1
B. 0 0
C. 1 0
D. 0 1
正解：A

質問 4：
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 };
vector<int>v(t, t+10);
multiset<int> s1(v.begin(),v.end());
s1.insert(v.begin(),v.end());
pair<multiset<int>::iterator,multiset<int>::iterator> range;
range = s1.equal_range(6);
while (range.first != range.second) {
cout<<*range.first<<" "; range.first++;
}
return 0;
}
A. program outputs: 5 7
B. program outputs: 1 1 6 6 5 5
C. program outputs: 5 5 7 7
D. program outputs: 6 6
E. program outputs: 5 5 6 6 7 7
正解：D

質問 5：
What happens when you attempt to compile and run the following code?
#include <list>
#include <iostream>
using namespace std;
bool mycomparison (int first, int second){return first>second;}
template<class T>
void print(T start, T end) {
while (start != end) {
std::cout << *start << " "; start++;
}
}
int main()
{
int t1[] ={ 1, 7, 8, 4, 5 };
list<int> l1(t1, t1 + 5);
int t2[] ={ 3, 2, 6, 9, 0 };
list<int> l2(t2, t2 + 5);
l1.sort(mycomparison);
l2.sort(mycomparison);
l1.merge(l2,mycomparison);
print(l1.begin(), l1.end());
print(l2.begin(), l2.end()); cout<<endl;
return 0;
}
A. program outputs: 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
B. program outputs: 9 8 7 6 5 4 3 2 1 0 9 6 3 2 0
C. program outputs: 0 1 2 3 4 5 6 7 8 9 0 2 3 6 9
D. program outputs: 0 1 2 3 4 5 6 7 8 9
E. program outputs: 9 8 7 6 5 4 3 2 1 0
正解：E

質問 6：
Which sentence is correct about the code below? Choose all that apply.
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
class F {
int val;
public:
F(int v):val(v){}
bool operator() (int v) {
if (v == val) return true;
return false;
}
};
int main() {
int t[] = { 10, 5, 9, 6, 2, 4, 7, 8, 3, 1 };
vector<int> v1(t, t + 10);
if (find(v1.begin(), v1.end(), 6) == find(v1.begin(), v1.end(), F(6))) { cout<<"Found!\n";
} else {
cout<<"Not found!\n";
}
return 0;
}
A. it will display Found!
B. it will display Not found!
C. it will not compile successfully
D. it will compile successfully
正解：C