First we must decide how to store floating-point numbers internally: in this case we'll simply store 100x to represent x, so that "5.46'' will be parsed as 546.

[ DigitNumber n type x;
  x = NextWordStopped(); if (x==-1) return -1; wn--;
  if (type==0)
  {   x = WordAddress(wn);
      if (x->n>='0' && x->n<='9') return (x->n) - '0';
      return -1;
  }
  if (x=='nought' or 'oh') { wn++; return 0; }
  x = TryNumber(wn++); if (x==-1000  x>=10) x=-1; return x;
];
[ FloatingPoint a x b w d1 d2 d3 type;
  a = TryNumber(wn++);
  if (a==-1000) return -1;
  w = NextWordStopped(wn); if (w==-1) return a*100;
  x = NextWordStopped(wn); if (x==-1) return -1; wn--;
  if (w=='point') type=1;
  else
  {   if (WordAddress(wn-1)->0~='.'  WordLength(wn-1)~=1)
          return -1;
  }
  d1 = DigitNumber(0,type);
  if (d1==-1) return -1;
  d2 = DigitNumber(1,type); d3 = DigitNumber(2,type);
  b=d1*10; if (d2>=0) b=b+d2; else d3=0;
  if (type==1)
  {   x=1; while (DigitNumber(x,type)>=0) x++; wn--;
  }
  else wn++;
  parsed_number = a*100 + b;
  if (d3>=5) parsed_number++;
  return 1;
];