C++ Template Test – 3

1. What will be the output of the following C++ code?

#include <iostream>
using namespace std;
template <class T>
class Test
{
  private:
    T val;
  public:
    static int count;
    Test()  {   
    	count++;   
    }
};
template<class T>
int Test<T>::count = 0;
int main()
{
    Test<int> a;
    Test<int> b;
    Test<double> c;
    cout << Test<int>::count << endl;
    cout << Test<double>::count << endl;
    return 0;
}

2. What will be the output of the following C++ code?

#include <iostream>
using namespace std; 
template <typename T>
void fun(const T&x)
{
    static int count = 0;
    cout << "x = " << x << " count = " << count;
    ++count;
    return;
}
 
int main()
{
    fun<int> (1); 
    cout << endl;
    fun<int>(1); 
    cout << endl;
    fun<double>(1.1);
    cout << endl;
    return 0;
}

3. What will be the output of the following C++ code?

#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;
}

4. What will be the output of the following C++ code?

#include <iostream>
using namespace std; 
template <class T, int max>
int arrMin(T arr[], int n)
{
   int m = max;
   for (int i = 0; i < n; i++)
      if (arr[i] < m)
         m = arr[i];
 
   return m;
}
 
int main()
{
   int arr1[]  = {10, 20, 15, 12};
   int n1 = sizeof(arr1)/sizeof(arr1[0]);
 
   char arr2[] = {1, 2, 3};
   int n2 = sizeof(arr2)/sizeof(arr2[0]);
 
   cout << arrMin<int, 10000>(arr1, n1) << endl;
   cout << arrMin<char, 256>(arr2, n2);
   return 0;
}

5. What will be the output of the following C++ code?

#include<iostream>
#include<stdlib.h>
using namespace std; 
template<class T, class U>
class A  
{
    T x;
    U y;
};
 
int main()  
{
   A<char, char> a;
   A<int, int> b;
   cout << sizeof(a) << endl;
   cout << sizeof(b) << endl;
   return 0;
}

6. Which of the following is correct about templates?

7. Which of the following is used for generic programming?

8. What will be the output of the following C++ function?

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

9. What will be the output of the following C++ code?

#include <iostream>
using namespace std; 
template <class T>
T max (T &a, T &b)
{
	cout << "Template Called ";
    return (a > b)? a : b;
}
 
template <>
int max <int> (int &a, int &b)
{
    cout << "Called ";
    return (a > b)? a : b;
}
 
int main ()
{
    int a = 10, b = 20;
    cout << max <int> (a, b);
}

10. What will be the output of the following C++ code?

#include<iostream>
#include<stdlib.h>
using namespace std; 
template<class T, class U, class V=double>
class A  
{
    T x;
    U y;
    V z;
};
 
int main()
{
   A<int, int> a;
   A<double, double> b;
   cout << sizeof(a) << endl;
   cout << sizeof(b) << endl;
   return 0;
}