Uva 10260 - Soundex Solution

Problem Link
Uva 10260 - Soundex Solution

#include<cstdio>
char in[100];
int o;
int dex(char c) {
 switch(c) {
  case 'B':case 'F':case 'P':case 'V':
   return 1;
  case 'C':case 'G':case 'J':case 'K':case 'Q':case 'S':case 'X':
  case 'Z':
   return 2;
  case 'D':case 'T':
   return 3;
  case 'L':
   return 4;
  case 'M':case 'N':
   return 5;
  case 'R':
   return 6;
 }
 return -1;
}

int main() {
 while(scanf("%s", in) == 1) {
  o = -1;
  for(int i = 0;; i++)
   if(in[i] == 0) break;
   else
    if(dex(in[i]) != o && (o = dex(in[i])) > 0)
     printf("%d", o);
  printf("\n");
 }
}