练习3.数字和数学计算

• plus 加号

• minus 减号
  / slash 斜杠 除法

• asterisk 星号 乘法
  % percent 百分号 模除
  < 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