Question 126
What happens when you attempt to compile and run the following code?
#include <iostream> #include <string>
using namespace std;
int main()
{
string s1[]= {"How" , "to" };
s1[0].swap(s1[1]);
for (int i=0; i<2; i++) {
cout << s1[i];
}
return( 0 );
}
Question 127
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
class A {
public:
A() { cout << "A no parameters";}
A(string s) { cout << "A string parameter";}
A(A &a) { cout << "A object A parameter";}
};
class B : public A {
public:
B() { cout << "B no parameters";}
B(string s) { cout << "B string parameter";}
};
int main () {
A a2("Test");
B b1("Alan");
B b2(b1);
return 0;
}
Question 128
What happens if character 3 is entered as input?
#include <iostream>
using namespace std;
class A {
public:
int i;
};
int main () {
int c;
A obj;
obj.i = 5;
cin >> c;
try
{
switch (c)
{
case A: throw 20;
case B: throw 5.2f;
case C: throw obj;
default: cout<<"No exception";
}
}
catch (int e)
{ cout << "int exception. Exception Nr. " << e; }
catch (A e)
{ cout << "object exception. Exception Nr. " << e.i; }
catch (...)
{ cout << "An exception occurred."; }
return 0;
}
Question 129
What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int main()
{
const char *s;
char str[] = "Hello";
s = str;
while(*s) {
cout << *s++;
}
return 0;
}
Question 130
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
class A {
protected:
int y;
public:
int x,z;
A() : x(1), y(2), z(0) { z = x + y; }
A(int a, int b) : x(a), y(b) { z = x + y;}
void Print() { cout << z; }
};
class B : public A {
public:
int y;
B() : A() {}
B(int a, int b) : A(a,b) {}
void Print() { cout << z; }
};
int main () {
A b;
b.Print();
return 0;
}