Create 1271-Hexspeak.cpp

Author: DionysiosB

1271-Hexspeak.cpp

@@ -0,0 +1,21 @@
+class Solution {
+public:
+    string toHexspeak(string num) {
+        long n(0);
+        for(int p = 0; p < num.size(); p++){n = 10 * n + (num[p] - '0');}
+        
+        std::string s;
+        while(n){
+            int m = n % 16;
+            if(1 < m && m < 9){return "ERROR";}
+            
+            if(m == 0){s += 'O';}
+            else if(m == 1){s += "I";}
+            else{s += (char)((m - 10 ) + 'A');}
+            n /= 16;
+        }
+
+        std::reverse(s.begin(), s.end());
+        return s;
+    }
+};