Class Template Specialization in C++ Hacker Rank Solution | HackerRank Programming Solutions | HackerRank C++ Solutions

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Introduction To C++

C++ is a general-purpose programming language that was developed as an enhancement of the C language to include object-oriented paradigm. It is an imperative and a compiled language. 

C++ is a middle-level language rendering it the advantage of programming low-level (drivers, kernels) and even higher-level applications (games, GUI, desktop apps etc.). The basic syntax and code structure of both C and C++ are the same. 

C++ programming language was developed in 1980 by Bjarne Stroustrup at bell laboratories of AT&T (American Telephone & Telegraph), located in U.S.A. Bjarne Stroustrup is known as the founder of C++ language.

Class Template Specialization in C++ - Hackerrank Solution


You are given a main function which reads the enumeration values for two different types as input, then prints out the corresponding enumeration names. Write a class template that can provide the names of the enumeration values for both types. If the enumeration value is not valid, then print unknown.

Input Format :

The first line contains t, the number of test cases.
Each of the t subsequent lines contains two space-separated integers. The first integer is a color value, c, and the second integer is a fruit value, f.

Constraints :

  • 1<= t <=100
  • -2*10^9 <= c <= 2*10^9
  • -2*10^9 <= f <= 2*10^9

Output Format:

The locked stub code in your editor prints t lines containing the color name and the fruit name corresponding to the input enumeration index.

Sample Input :

1 0
3 3

Sample Output :

green apple
unknown unknown

Explanation :

Since t = 2, there are two lines of output.

  1. The two input index values, 1 and 0, correspond to green in the color enumeration and apple in the fruit enumeration. Thus, we print green apple.
  2. The two input values, 3 and 3, are outside of the range of our enums. Thus, we print unknown unknown.
C++ Class Template Specialization in C++ – Hacker Rank Solution
#include <iostream>
using namespace std;
enum class Fruit { apple, orange, pear };
enum class Color { red, green, orange };

/* C++ Class Template Specialization in C++ - Hacker Rank Solution START */
template <typename T> struct Traits;
char s []="unknown";
char f0 []="apple";
char f1 []="orange";
char f2 []="pear";
char c0 []="red";
char c1 []="green";
char c2 []="orange";
template <>
struct Traits<Fruit>
    static char* name(int a)
        if(a>=3 || a<0)
            return s;
        else if (a==0)
            return f0;
        else if (a==1)
            return f1;
            return f2;            

template <>
struct Traits<Color>
    static char* name(int a)
        if(a>=3 || a<0)
            return s;
        else if (a==0)
            return c0;
        else if (a==1)
            return c1;
            return c2;  
/* C++ Class Template Specialization in C++ - Hacker Rank Solution END */

int main()
	int t = 0; std::cin >> t;

    for (int i=0; i!=t; ++i) {
        int index1; std::cin >> index1;
        int index2; std::cin >> index2;
        cout << Traits<Color>::name(index1) << " ";
        cout << Traits<Fruit>::name(index2) << "\n";

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