習題21 - 函數可以返回一些東西

用Notepad++打下列的程式碼,
另存為ex21.py. 我附上中文注釋方便好讀.

# -*- coding: UTF-8 -*-
#定義函數叫add, 返回 a + b之值
def add (a, b):
    print (f"ADDING {a} + {b}")
    return a + b

#定義函數叫subtract, 返回 a - b之值
def subtract (a, b):
    print (f"SUBTRACTING {a} - {b}")
    return a - b

#定義函數叫multiply, 返回 a * b之值
def multiply (a, b):
    print (f"MULTIPLYING {a} * {b}")
    return a * b

#定義函數叫divide, 返回 a / b之值
def divide (a, b):
    print (f"DIVIDE {a} / {b}")
    return a / b

print ("Let's do some math with just functions!")

#變量age, height, weight 和 iq. 他們調用函數add, subtract, multiply, divide並傳入其需要的變量.
age = add (30, 5)
height = subtract (78, 4)
weight = multiply (90, 2)
iq = divide (100, 2)

#印出來age, height, weight 和 iq經過函數調用後的值.
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.")
#這裡的運作方式是從內(iq,2), 一直往外(age)算
#然後iq = divide, divide函數需要兩個值, 一個就是50 (100/2), 另外一個就是Line 36所示:2
what = add (age, subtract (height, multiply (weight, divide (iq, 2))))

print ("That become: ", what, "Can you do it by hand?")

然後用Windows的cmd, 執行python打開它.

C:\Users\Peter\Desktop\Python\LP3THW>python ./ex21.py
Let's do some math with just functions!
ADDING 30 + 5
SUBTRACTING 78 - 4
MULTIPLYING 90 * 2
DIVIDE 100 / 2
Age: 35, Height: 74, Weight: 180, IQ: 50.0
Here is a puzzle.
DIVIDE 50.0 / 2
MULTIPLYING 180 * 25.0
SUBTRACTING 74 - 4500.0
ADDING 35 + -4426.0
That become:  -4391.0 Can you do it by hand?

C:\Users\Peter\Desktop\Python\LP3THW>

完成

Line 37 算法主要是由內向外
所以整行表示age(35) + (height (74) - (weight (180) * (iq(50) / 2)))
= 35 + (74 - (180 * 25))
= 35 + (74 - 4500)
= 35 + (-4426)
= -4391

可以用print調用出來看看. print (">>>>", age, height, weight, iq)


最初發表 / 最後更新: 2018.08.24 / 2018.08.24