C++ Class Template Specialization in C++ - Hacker Rank Solution
Problem
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 :
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 :
2 1 0 3 3
Sample Output :
green apple unknown unknown
Explanation :
- 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.
- The two input values, 3 and 3, are outside of the range of our enums. Thus, we print unknown unknown.
Solution :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | //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> { public: static char* name(int a) { if(a>=3 || a<0) return s; else if (a==0) return f0; else if (a==1) return f1; else return f2; } }; template <> struct Traits<Color> { public: static char* name(int a) { if(a>=3 || a<0) return s; else if (a==0) return c0; else if (a==1) return c1; else 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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