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for(i=0; i<max_laenge; i++) if (eingabe_zeile[i] == '?') anz_fragen++;

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Token_value get_token()
{
  char ch = 0;
  cin>>ch;
  
  switch(ch) {
  case 0:
           return curr_tok=END;
  case ';':
  case '*':
  case '/':
  case '+':
  case '-':
  case '(':
  case ')':
  case '=':
            return curr_tok=Token_value(ch);
  case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8':
  case '9': case '.':
            cin.putback(ch);
            cin >> number_value;
            return curr_tok=NUMBER;
  default:
            if(isalpha(ch)) {
                  cin.putback(ch);
                  cin>>string_value;
                  return curr_tok=NAME:
             }
             error("Falsches Token");
             return curr_tok=PRINT;
   }
}

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while((read == true) && (understand == false)) { understand(read(book)); }