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; }
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[] = { 1, 5, 2, 5, 2, 4, 4, 3, 3, 1 };
vector<int> v1(t, t+10);
set<int> s1(t, t+10);
replace(v1.begin(), v1.end(), 1, 10);
replace(s1.begin(), s1.end(), 1, 10);
for_each(v1.begin(), v1.end(), myfunction);
return 0;
}
Program outputs:
What will happen 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);
set<int> s1(v.begin(),v.end());
s1.insert(v.begin(),v.end());
bool found = s1.find(7);
if (found){
cout<<"Element found!\n";
}else {
cout<<"Element not found!\n";
}
return 0;
}
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:
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;
}
struct sequence {
int val,inc;
sequence(int s, int i):val(s),inc(i){}
int operator()(){
int r = val; val += inc;
return r;
}
};
int main() {
vector<int> v1(10);
fill(v1.begin(), v1.end(), sequence(1,1));
for_each(v1.begin(), v1.end(), myfunction);
return 0;
}
Program outputs:
