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41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
def round_up(num, power=0):
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"""
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实现精确四舍五入，包含正、负小数多种场景
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:param num: 需要四舍五入的小数
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:param power: 四舍五入位数，支持0-∞
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:return: 返回四舍五入后的结果
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"""
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try:
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print(1 / 0)
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except ZeroDivisionError:
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digit = 10 ** power
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num2 = float(int(num * digit))
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# 处理正数，power不为0的情况
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if num >= 0 and power != 0:
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tag = num * digit - num2 + 1 / (digit * 10)
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if tag >= 0.5:
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return (num2 + 1) / digit
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else:
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return num2 / digit
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# 处理正数，power为0取整的情况
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elif num >= 0 and power == 0:
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tag = num * digit - int(num)
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if tag >= 0.5:
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return (num2 + 1) / digit
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else:
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return num2 / digit
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# 处理负数，power为0取整的情况
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elif power == 0 and num < 0:
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tag = num * digit - int(num)
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if tag <= -0.5:
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return (num2 - 1) / digit
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else:
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return num2 / digit
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# 处理负数，power不为0的情况
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else:
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tag = num * digit - num2 - 1 / (digit * 10)
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if tag <= -0.5:
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return (num2 - 1) / digit
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else:
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return num2 / digit
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