将数字四舍五入到最近的十

时间:2017-02-09 14:52:48

标签: python rounding

我的程序中需要一段代码才能得到一个数字," dSum"在我的代码中,将向上四舍五入到最接近的十位。例如,如果dSum是33,我需要dSumRounded为40.我已经拥有的代码行是错误的,它似乎是将向下舍入到最近的十。我从另一个stackoverflow问题中找到了那段代码,但它并没有在这种情况下工作。

import math #Imports the math library

def findCheckDigit():
    code = input("Please enter your 7 digit code: ")  #Makes a function and sets the code to a variable

    d1 = int(code[0]) * 3
    d2 = int(code[1]) * 1
    d3 = int(code[2]) * 3
    d4 = int(code[3]) * 1    #Seperates each digit and assigns it to a variable, multiplying it by 3 or 1 
    d5 = int(code[4]) * 3
    d6 = int(code[5]) * 1
    d7 = int(code[6]) * 3

    dSum = d1 + d2 + d3 + d4 + d5 + d6 + d7      #Adds each digit together
    dSumRounded = int(math.ceil(dSum / 10.0)) * 10   #Gets the rounded up version of the sum of the digits
    checkDigit = dSumRounded - dSum   #Makes the check digit equal to the sum of digits taken away from the rounded up sum of digits

    print(dSumRounded)
    print("Your check digit is: " + str(checkDigit))   #Prints the check digit

1 个答案:

答案 0 :(得分:1)

我更喜欢呆在整个地区。

>>> for i in range(20, 40):
        print(i, '->', (i + 9) // 10 * 10)

20 -> 20
21 -> 30
22 -> 30
23 -> 30
24 -> 30
25 -> 30
26 -> 30
27 -> 30
28 -> 30
29 -> 30
30 -> 30
31 -> 40
32 -> 40
33 -> 40
34 -> 40
35 -> 40
36 -> 40
37 -> 40
38 -> 40
39 -> 40

那就是说,你自己的表达式int(math.ceil(dSum / 10.0)) * 10也有效。