C++ Programming Multiple Choice Questions - References
This section focuses on the "References" in C++ programming langauge. These Multiple Choice Questions (MCQ) should be practiced to improve the C++ programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
1. Reference is like a?
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2. A References is :
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3. A variable can be declared as reference by putting _______ in the declaration.
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4. If a function receives a reference to a variable, can it modify the value of the variable?
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5. Through references we can avoid?
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6. References can be NULL?
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7. How many objects reference can refer during its lifetime?
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8. Dereference operator is also called as
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9. Which operator is used to de-references to an object?
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10. Which of the following is an advantage of reference?
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11. What is the return value of f(p, p) if the value of p is initialized to 5 before the call? Note that the first parameter is passed by reference, whereas the second parameter is passed by value.
#include <iostream>
using namespace std;
int LFC(int &x, int c)
{
c = c - 1;
if (c == 0) return 1;
x = x + 1;
return LFC(x, c) * x;
}
int main()
{
int p = 5;
printf("%d", LFC(p, p));
}
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12. What is the output of this program?
#include <iostream>
using namespace std;
int &LFC()
{
static int p = 10;
return p;
}
int main()
{
LFC() = 30;
cout << LFC();
return 0;
}
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13. What is the output of this program?
#include <iostream>
using namespace std;
int &LFC()
{
int p = 10;
return p;
}
int main()
{
LFC() = 30;
cout << LFC();
return 0;
}
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14. Which of the following statement is correct about the program given below?
#include <iostream>
using namespace std;
int main()
{
int p = 10;
int& q = p;
q = 20;
cout << "p = " << p << endl ;
p = 30;
cout << "q = " << q << endl;
return 0;
}
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15. Which of the following is true about the following program
#include <iostream>
using namespace std;
int main()
{
int p = 45;
int &q = p;
p++;
cout << p << " " << --q;
return 0;
}
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16. What will be the output of this program?
#include <iostream>
using namespace std;
int main()
{
int p = 45;
int q& = p;
p++;
cout << p << " " << --q;
return 0;
}
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17. What will be the output of this program?
#include <iostream>
using namespace std;
int main()
{
int p = 10, q = 20;
int *ptr = & p;
int &ref = q;
*ptr++;
ref++;
cout<< p << " " << q;
return 0;
}
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18. What will be the output of the following program?
#include <iostream>
using namespace std;
enum find
{
a, b, c
};
int main()
{
int x = a, y = b, z = c;
int &p = x, &q = y, &r = z;
p = ++x;
q = ++y;
r = ++c;
cout<< p << q << r;
return 0;
}
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19. What will be the output of the following program?
#include <iostream>
using namespace std;
class LFC
{
int x, y;
public:
void SetValue(int &xx, int &yy)
{
x = xx++;
y = yy;
cout<< xx << " " << yy;
}
};
int main()
{
int x = 10;
int &y = x;
LFC obj;
obj.SetValue(x , y);
return 0;
}
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20. What will be the output of the following program?
#include <iostream>
using namespace std;
class course
{
int x, y;
public:
course(int xx = 0, int yy = 0)
{
x = xx;
y = yy;
}
void Display()
{
cout<< x << " " << y;
}
course operator +(course z)
{
course temp;
temp.x = x + z.x;
temp.y = y + z.y;
return temp;
}
};
int main()
{
course obj(90, 80);
course obj2(10, 20);
course objSum;
course &ref = objSum;
ref = obj + obj2;
ref.Display();
return 0;
}
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21. Which value can we not assign to reference?
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22. The terms lvalue and rvalue is referred to the things that appears on
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23. Which of the following statements is correct?
i) Once a reference variable has been defined to refer to a particular variable it can refer to any other variable.
ii) A reference is not a constant pointer.
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24. Which of the following statements is correct? i) Change a reference changes the referent. ii) We can create an array of references.
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25. Which of the following statement is correct?
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