笨辦法學python習題21 函式可以返回某些東西

我們已經學過用=給變數賦值，這次習題我們將學習用return來將函式的值賦給變數：

**如下：

#-*-coding:utf-8-*-

def add(a, b):
#加法函式
print"adding %d + %d"%(a, b)
return a+b
def subtract(a, b):
#減法函式
print"subtract %d - %d"%(a, b)
return a - b
def multiply(a,b):
#乘法函式
print"multiply %d * %d"%(a, b)
return a*b
def divide(a, b):
#除法函式
print"divide %d / %d"%(a,b)
return a/b
print"let's do some math with just functions!"
age = add(30, 5)            #返回20-5給age
height = subtract(78, 4)    #返回78-4給height
weight = multiply(90, 2)    #返回90*2給weight
iq = divide(100, 2)         #返回100/2給divide
print"age: %d,height:%d,weight:%d,iq:%d"%(age, height, weight, 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?"

simengred$ python ex21.py

let's do some math with just functions!
adding 30 + 5
subtract 78 - 4
multiply 90 * 2
divide 100 / 2
age: 35,height:74,weight:180,iq:50
here is a puzzle.
divide 50 / 2
multiply 180 * 25
subtract 74 - 4500
adding 35 + -4426
that becomes: -4391 can you do it by hand?

例如：

what = add(age,subtract(height,multiply(weight,divide(iq,2))))

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