C++ Programming MCQ - Templates

11. What is the output of this program?

#include <iostream>

using namespace std;
template <typename T>
T max (T& p, T& q) 
    {
        return (p>q?p:q);
    }
int main () 
{
 	int x = 55, y = 60, m;
	long a = 105, b = 53, n;
	m = max(x, y);
	n = max(a, b);
	cout << m << endl;
	cout << n << endl;
	return 0;
}

A. 60
B. 60 105
C. 50 105
D. 60 53

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12. What is the output of this program?

#include <iostream>

using namespace std;
template <typename T>
void loopIt(T x)
{   int num=3;
	T lfc[num];
	for(int p = 0; p < num; p++)
	{
		lfc[p] = x++;
        cout <<  lfc[p] << endl;
    }
};

int main()
{
	float q = 2.1;
	loopIt(q);
} 

A. 2.1
B. 3.1
C. 4.1
D. 2.1 3.1 4.1

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13. What is the output of this program?

#include <iostream>

using namespace std;
template <typename T>
T maximum(T x, T y)
{
    return (x > y)? x : y;
}
int main()
{
    cout << maximum(3, 7) << std::endl;
    cout << maximum(3.0, 7.0) << std::endl;
    cout << maximum(3, 7.0) << std::endl;
    return 0;
}

A. Compiler Error in last cout statement as call to maximum is ambiguous
B. Compiler Error in all cout statements as data type is not specified
C. 7 7.0 7.0
D. None of the above

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14. Which of the following statement is correct about the program given below?

#include <iostream>

using namespace std;
template <class T, class U>
class A  {
    T x;
    U y;
    static int count;
};
 
int main()  {
   A<char, char> p;
   A<int, int> q;
   cout << sizeof(p) << endl;
   cout << sizeof(q) << endl;
   return 0;
}

A. Compiler Error: There can not be more than one template arguments.
B. 6 12
C. 8 8
D. 2 8

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15. Which of the following is true about the following program

#include <iostream>

using namespace std;
template <class P, class Q, class R>
class A  {
    P x;
    Q y;
    R z;
    static int count;
};

int main()
{
   A<int, int, int> m;
   A<char, char, char> n;
   cout << sizeof(m) << endl;
   cout << sizeof(n) << endl;
   return 0;
}  

A. Compiler Error: template parameters cannot have default values
B. 12 6
C. 12 3
D. 6 3

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16. What will be the output of this program?

#include <iostream>
using namespace std;
 
template <int i>
void fun()
{
   i = 20;
   cout << i;
}
 
int main()
{
   fun<10>();
   return 0;
}

A. Compile Error
B. 10
C. 20
D. 15

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17. What will be the output of this program?

#include <iostream>
using namespace std;
  
template<int n> struct funStruct
{
    static const int val = 2*funStruct<n-1>::val;
};
  
template<> struct funStruct<0>
{
    static const int val = 1 ;
};
  
int main()
{
    cout << funStruct<10>::val << endl;
    return 0;
}

A. Compiler Error
B. 1
C. 2
D. 1024

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18. What will be the output of the following program?

         
Note:Includes all required header files

using namespace std;
template < typename T >
void print_mydata(T find)
{
	cout << find << endl;
}

int main()
{
	double p = 17.5;
	string s("Hi to all");
	print_mydata( p );
	print_mydata( s );
	return 0;
}  

A. 17.5 Hi to all
B. 17.5
C. Hi to all
D. None of the above

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19. How many bits of memory needed for internal representation of class?

A. 1
B. 2
C. 4
D. No memory needed

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20. What can be passed by non-type template parameters during compile time?

A. Int
B. Float
C. Constant expression
D. None of the above

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