Experiment 02 function call

Purpose

Learn how to create functions
Know how to call functions
Master the role of functions that return no value
Understanding functions applied to functions

Laboratory equipment

Jupter Notebook

Experimental content

1. (30 points)

Complete the body of the following function according to the function's docstring.

Hint: Python has a built-in function for this round.

The round() method returns the rounded value of the floating point number x.

round()Method syntax:

round( x [, n] )
parameter

x: Numeric expression.
n: Numerical expression, indicating the number of digits from the decimal point.

def round_to_two_places(num):
    """返回给定的四舍五入到小数点后两位的数字。 
    
    >>> round_to_two_places(3.14159)
    3.14
    """
    # 用你自己的代码替换这个部分。
    # ("pass" 是一个关键字，它什么都没做，我们使用它作为占位符，
    # 因为在开始一个代码块之后，Python至少需要一行代码)
    return round(num, 2)

function test

round_to_two_places(4.2562)

4.26

2. (30 points)

roundThe help specification ndigits(second parameter) may be negative.

what do you think it will happen Try some examples in the cells below?

# Put your test code here
round(123456789,-3)

123457000

Can you think of a useful example?

Can write an example you can think of

round(9634057,-5)

3. (40 points)

In an earlier programming problem, candy-sharing friends Alice, Bob, and Carol tried to divide the candy evenly. Any remaining candy is smashed for the sake of their friendship. For example, if they have a total of 91 candies, they will each take 30 and smash 1.

Below is a simple function that will calculate the number of candies to smash for any number of total candies.

Modify it so that it optionally accepts a second parameter that represents the number of friends the candy is divided equally. If no second argument is provided, it should assume 3 friends as before.

Update docstring to reflect this new behavior.

def to_smash(total_candies):
    """返回在3个朋友之间平均分配给定数量的糖果后必须粉碎的剩余糖果数量。
    
    >>> to_smash(91)
    1
    """
    return total_candies % 3

function test

Suppose there are four friends, the number of candies is 23, 36, 53, 46 respectively, call the function to calculate the number of candies to be smashed

#Put your test code here
def to_smash(total_candies, n_friends=3):
    """返回在n个朋友之间平均分配给定数量的糖果后必须粉碎的剩余糖果数量。
    默认为3个朋友
    
    >>> to_smash(91, 4)
    3
    """
    return total_candies % n_friends

#假设有四个朋友，糖果数分别为23，36，53，46，调用函数，计算要砸碎的糖果数
sum=23 + 36 + 53 + 46
print("sum=", sum)
to_smash(sum,4)

sum= 158
2