27 lines
826 B
Python
27 lines
826 B
Python
# 一.在不考虑四舍五入的情况下对一个数字进行保留两位小数 origin = 123.456789 结果：123.45
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# origin = 123.456789
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# print(int(origin*100)) # 12345
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# print(int(origin*100)/100) # 123.45
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# print(0.1 + 0.2)
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# 0.30000000000000004 IEEE745标准
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# print((0.1*10 + 0.2*10)/10)
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# 0.3 将小数扩大一定的倍数变成整数，然后结果再缩小对应的倍数
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# 二.给定两个变量 a = 5,b = 8 思考：如何在不声明第三个变量的情况下 交换变量a和b的值
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# a = 5
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# b = 8
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# c = a # 利用第三个变量接收a
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# a = b # a得到了b的值
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# b = c # b得到了c的值，c的值就是a
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# print(a,b) # 8 5
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# 如果交换的变量值是数字，通过计算进行交换
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# a = 5
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# b = 8
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# a = a + b # a = 13
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# b = a - b # b = 13 - 8 = 5
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# a = a - b # a = 13 - 5 = 8
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# print(a,b) |