What happens when you attempt to compile and run the following code?
#include
using namespace std;
class BaseClass
{
public:
int *ptr;
BaseClass(int i) { ptr = new int(i); }
~BaseClass() { delete ptr; delete ptr;}
void Print() { cout << *ptr; }
};
void fun(BaseClass x);
int main()
{
BaseClass o(10);
fun(o);
o.Print();
}
void fun(BaseClass x) {
cout << "Hello:";
}
Options
Discussion
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Correct Answer:
D
Explanation
:
Q: 2
What happens when you attempt to compile and run the following code?
#include
using namespace std;
class A {
public :
void print() {
cout << "A ";
}
};
class B {
public :
void print() {
cout << "B ";
}
};
int main() {
B sc[2];
B *bc = (B*)sc;
for (int i=0; iprint();
return 0;
}
Options
Discussion
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Correct Answer:
B
Explanation
:
Q: 3
What happens when you attempt to compile and run the following code?
Options
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Correct Answer:
B
Explanation
:
Q: 4
Which of the following is a user defined data type?
1:
struct person
{
char name[20];
int age;
};
2:
int l=2;
3:
enum color {red,blue, green};
Options
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Correct Answer:
A, C
Explanation
:
Q: 5
What happens when you attempt to compile and run the following code?
Options
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Correct Answer:
C
Explanation
:
Q: 6
What happens when you attempt to compile and run the following code?
#include
using namespace std;
int main (int argc, const char * argv[])
{
int tab[5]={1,2,3};
for (int i=0; i<5; i++)
cout <<tab[i];
return 0;
}
Options
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Correct Answer:
B
Explanation
:
Q: 7
What happens when you attempt to compile and run the following code?
#include
using namespace std;
int main()
{
const char *s;
char str[] = "Hello";
s = str;
while(*s) {
cout << *s++;
}
return 0;
}
Options
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Correct Answer:
B
Explanation
:
Q: 8
What happens when you attempt to compile and run the following code?
#include
#include
using namespace std;
int main()
{
string s1[]= {"H" , "t" };
string s;
for (int i=0; i<2; i++) {
s = s1[i];
s.insert(1,"o");
cout << s;
}
return( 0 );
}
Options
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Correct Answer:
A
Explanation
:
Q: 9
What happens when you attempt to compile and run the following code?
Options
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Correct Answer:
B
Explanation
:
Q: 10
Which code, inserted at line 18, generates the output "AB"
#include
using namespace std;
class A
{
public:
void Print(){ cout<< "A";}
void Print2(){ cout<< "a";}
};
class B:public A
{
public:
void Print(){ cout<< "B";}
void Print2(){ cout<< "b";}
};
int main()
{
B ob2;
//insert code here
ob2.Print();
}
Options
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Correct Answer:
D
Explanation
:
Q: 11
What happens when you attempt to compile and run the following code?
Options
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Correct Answer:
A
Explanation
:
Q: 12
What will be the output of the program?
#include
#include
using namespace std;
int fun(int);
int main()
{
float k=3;
k = fun(k);
cout<<k;
return 0;
}
int fun(int i)
{
i++;
return i;
}
Options
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Correct Answer:
C
Explanation
:
Q: 13
What happens when you attempt to compile and run the following code?
#include
using namespace std;
class A
{
public:
virtual void Print(){ cout<<"A";}
};
class B:public A
{
public:
virtual void Print(){ cout<Print();
B ob2;
obj = &ob2;
obj?>Print();
}
Options
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Correct Answer:
A
Explanation
:
Q: 14
What happens when you attempt to compile and run the following code?
#include
#include
using namespace std;
class complex{
double re;
double im;
public:
complex() : re(1),im(0.4) {}
bool operator==(complex &t);
};
bool complex::operator == (complex &t){
if((this?>re == t.re) && (this?>im == t.im))
return true;
else
return false;
}
int main(){
complex c1,c2;
if (c1==c2)
cout << "OK";
else {
cout << "ERROR";
}
}
Options
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Correct Answer:
A
Explanation
:
Q: 15
Which code line inserted instead of the comment below will fix the program so that it produces the
expected output and does not cause any memory leak?
Options
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Correct Answer:
A
Explanation
:
Q: 16
What will happen if the memory cannot be allocated?
Options
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Correct Answer:
D
Explanation
:
Q: 17
Which line of code inserted instead of the comment will make the following code run properly
without causing memory leaks?
Options
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Correct Answer:
D
Explanation
:
Q: 18
What happens if characters 'w', 'o', 'r', 'l' and 'd' are entered as input?
#include
#include
using namespace std;
int main()
{
string s1 = "Hello";
string s2;
getline( cin, s2 );
cout << s1 + s2;
return( 0 );
}
Options
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Correct Answer:
A
Explanation
:
Q: 19
Which of the following structures are correct?
1:
struct s1{
int x;
char c;
};
2:
struct s2{
float f;
struct s2 *s;
};
3:
struct s3{
float f;
in i;
}
Options
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Correct Answer:
A, B
Explanation
:
Q: 20
What happens when you attempt to compile and run the following code?
#include
using namespace std;
void print(char *c);
int main (int argc, const char * argv[])
{
print("Test");
return 0;
}
void print(char *c)
{
cout<<c;
}
