int Rev_Math(const char *string)
{
     static const char *p;
     p=string;
     switch(*p)
     {
          case '+':
               return Rev_Math(++p)+Rev_Math(++p);
          case '-':
               return Rev_Math(++p)-Rev_Math(++p);
          case '*':
               return Rev_Math(++p)*Rev_Math(++p);
          case '/':
               return Rev_Math(++p)/Rev_Math(++p);
          default:
               if(*p >= '0' && *p <= '9')
                    return *p-'0';
               return -1;
     }
 
}

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