C++ | Templates | Question 10

Output?

#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) 1024
(C) 2
(D) 1

Answer: (B)

Explanation: This is an example of template metaprogramming. The program mainly calculates 2^10.

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