NO.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. 11 10 9 8 7 6 5 4 3 2
B. 2 3 4 5 6 7 8 9 10 11
C. 10 9 8 7 6 5 4 3 2 1
D. compilation error
E. 1 2 3 4 5 6 7 8 9 10
Answer: D

CPP Success   

NO.2 What happens when you attempt to compile and run the following code?
#include <list>
#include <iostream>
using namespace std;
template<class T> void print(T start, T end) {
while (start != end) {
std::cout << *start << " "; start++;
}
}
class A {
int a;
public:
A(int a):a(a){}
operator int () const { return a;}int getA() const { return a;}
};
int main() {
int t1[] ={ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
list<A> l1(t1, t1 + 10);
list<A> l2(l1);
l2.reverse(); l1.splice(l1.end(),l2);
l1.pop_back();l1.unique();
print(l1.begin(), l1.end()); cout<<endl;
return 0;
}
A. compilation error
B. program outputs: 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2
C. program outputs: 1 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 1
D. program outputs: 1 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2
E. runtime exception
Answer: D

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