exercise 21

作者: 不娶名字 | 来源:发表于2018-01-02 13:18 被阅读0次
    def add(a, b):
        print(f"ADDING {a} + {b}")
        return a + b
    
    def subtract(a, b):
        print(f"SUBTRACTING {a} - {b}")
        return a - b
    
    def multiply(a, b):
        print(f"MULTIPLYING {a} * {b}")
        return a * b
    
    def divide(a, b):
        print(f"DIVIDING {a} / {b}")
        return a / b
    
    
    print("Let's do some math with just functions!")
    
    age = add(30, 5)
    height = subtract(78, 4)
    weight = multiply(90, 2)
    iq = divide(100, 2)
    
    print(f"Age: {age}, Height: {height}, Weight: {weight}, IQ: {iq}")
    
    
    # A puzzle for the extra credit, type it in anyway.
    print("Here is a puzzle.")
    
    what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
    
    print("That becomes: ", what, "Can you do it by hand?")
    

    练习

    1. 如果你不是很确定return的功能,尝试自己写几个函数出来,让它们返回一些值。你可以将任何可以放在=右边的东西作为一个函数的返回值。
    2. 这个脚本的结尾是一个迷题。我将一个函数的返回值用作了另外一个函数的参数。我将它们连接一起,就像写数学等式一样。这样可能有些难懂,不过运行一下你就知道结果了。你可以试试看能不能用正常的方法实现和这个表达式一样的功能。
    3. 一旦你解决了这个迷题,试着修改一下函数里的某些部分,然后看会有什么样的结果。你可以有目的地修改它,让它输出另外一个值。
    4. 颠倒过来再做一次。写一个简单的等式,使用相同的函数来计算它。

    答案

    这个计算是从里到外的

    def add(a, b):
        print(f"ADDING {a} + {b}")
        return a + b
    
    def subtract(a, b):
        print(f"SUBTRACTING {a} - {b}")
        return a - b
    
    def multiply(a, b):
        print(f"MULTIPLYING {a} * {b}")
        return a * b
    
    def divide(a, b):
        print(f"DIVIDING {a} / {b}")
        return a / b
    
    
    print("Let's do some math with just functions!")
    
    age = add(30, 5)
    height = subtract(78, 4)
    weight = multiply(90, 2)
    iq = divide(100, 2)
    
    print(f"Age: {age}, Height: {height}, Weight: {weight}, IQ: {iq}")
    
    
    # A puzzle for the extra credit, type it in anyway.
    print("Here is a puzzle.")
    
    
    first = divide(iq, 2)
    second = multiply(weight, first)
    third = subtract(height, second)
    what = add(age, third)
    
    
    print("That becomes: ", what, "Can you do it by hand?")
    
    # 这是练习3的答案
    practice = subtract(age, divide(height, divide(weight, add(iq, 2))))
    print(practice)
    

    公式:7-(5/(4+3*(2+1)))

    def add(a, b):
        return a + b
    
    def subtract(a, b):
        return a - b
    
    def multiply(a, b):
        return a * b
    
    def divide(a, b):
        return a / b
    
    
    number = subtract(7, add(4, multiply(3, add(2, 1))))
    print(f"the answer is {number}")
    

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