习题4--变量和命名

一：代码

cars = 100space_in_a_car = 4.0drivers = 30passengers = 90cars_not_driven = cars - driverscars_driven = driverscarpool_capacity = cars_driven * space_in_a_caraverage_passengers_per_car = passengers / cars_drivenprint "There are", cars, "cars available."print "There are only", drivers, "drivers available."print "There will be", cars_not_driven, "empty cars today.70"print "We can transport", carpool_capacity, "people today.120.0"print "We have", passengers, "to carpool today."print "We nees to put about", average_passengers_per_car, "in each car."

二：附件练习
1：4.0作为space_in_a_car的值有没有必要？只有4会有什么问题？
答：4.0是浮点数，更精确。4是整数。
2：研究一下浮点数。
3：在每一个变量赋值的上一行加上一行注释。

4：。。。

5：。。。

6：。。。

注：

1：

①=的作用是将右边的值赋给左边的变量名。

例：A = 100 把值100赋值给变量A

B = A 把A的值赋值给B

②==的作用是检查左右两边是否相等。

2：写成A = 100 和A=100的区别

A = 100 ①易读 ②看起来美观

A=100 ①这种写法不建议使用。