将非负整数转化为大写数字的方法是什么?
时间: 2023-05-18 16:06:40 浏览: 74
将非负整数转化为大写数字的方法可以通过编写一个函数来实现。以下是一个示例函数:
```python
def num_to_words(num):
ones = ['','one','two','three','four','five','six','seven','eight','nine']
tens = ['','ten','twenty','thirty','forty','fifty','sixty','seventy','eighty','ninety']
teens = ['','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen']
scales = ['','thousand','million','billion','trillion']
num_str = str(num)
num_len = len(num_str)
groups = (num_len + 2) // 3
num_str = num_str.zfill(groups * 3)
words = []
for i in range(0, groups * 3, 3):
h, t, u = int(num_str[i]), int(num_str[i+1]), int(num_str[i+2])
g = groups - (i // 3 + 1)
if h >= 1:
words.append(ones[h])
words.append('hundred')
if t > 1:
words.append(tens[t])
if u >= 1:
words.append(ones[u])
elif t == 1:
if u >= 1:
words.append(teens[u])
else:
words.append(tens[t])
else:
if u >= 1:
words.append(ones[u])
if (g >= 1) and ((h + t + u) > 0):
words.append(scales[g])
return ' '.join(words) or 'zero'
```
这个函数将一个非负整数转换为大写数字,例如:
```python
num_to_words(123456789)
# 输出:'one hundred twenty three million four hundred fifty six thousand seven hundred eighty nine'
```
注意,这个函数只适用于非负整数,如果输入负数,将会抛出异常。