Ex21 Functions Can return Something

函数返回值

这个练习里，将展示如何让一个返回一个设定的结果。代码如下:

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def add(a, b):
    print "ADDING %d + %d" % (a, b)
    return a + b
def subtract(a, b):
    print "SUBTRACTING %d - %d" % (a, b)
    return a - b
def multiply(a, b):
    print "MULTIPLYING %d + %d" % (a, b)
    return a * b
def divide(a, b):
    print "DIVIDING %d / %d" % (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 "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's becomes:" , what, "Can you do it by hand?"

运行结果如图:

小结

都是整数，没有使用到浮点数，可以试着加入浮点数看看结果。