Roman to Integer

Given a roman numeral, convert it to an integer.

Input is guaranteed to be within the range from 1 to 3999.

  inline int c2n(char c) {
       switch(c) {
         case 'I': return ;
         case 'V': return ;
         case 'X': return ;
         case 'L': return ;
         case 'C': return ;
         case 'D': return ;
         case 'M': return ;
         default: return ;
       }
     }
 class Solution {
 public:
     int romanToInt(string s) {

       // Start typing your C/C++ solution below
       // DO NOT write int main() function
       int result=;
       int len=s.length();
       result=c2n(s[]);
       for(int i =; i< len; i++)
       {
         if(c2n(s[i]) > c2n(s[i-]))
         {
           result +=(c2n(s[i]) - *c2n(s[i-]));
         }
         else
         {
           result += c2n(s[i]);
         }
       }
       return result;
     }
 };