数字和数学计算
这章练习里有很多的数学运算符号。我们来看一遍它们都叫什么名字

• +plus 加号
• -minus 减号
• / slash 斜杠
• *asterisk 星号
• % percent 百分号
• < less-than 小于号
• greater-than 大于号
• <= less-than-equal 小于等于号

• =greater-than-equal 大于等于号

print ("I will now count my chickens:")
print ("Hens", 25 + 30 / 6)
print ("Roosters", 100 - 25 * 3 % 4)
print ("Now I will count the eggs:")
print (3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6)
print ("Is it true that 3 + 2 < 5 - 7?")
print (3 + 2 < 5 - 7)
print ("What is 3 + 2?", 3 + 2)
print ("What is 5 - 7?", 5 - 7)
print ("Oh, that's why it's False.")
print ("How about some more.")
print ("Is it greater?", 5 > -2)
print ("Is it greater or equal?", 5 >= -2)
print ("Is it less or equal?", 5 <= -2)

运行结果