我想从Ruby中另外两个变量的总和创建一个新的局部变量，但我'；我卡住了

我试图改变一个例子，采用用户输入，而不是使用硬编码的值，然后使用这些局部变量来计算所需的项

到目前为止，我的代码如下所示：

print "Number of cars available today." 
cars = gets.chomp()
print "Number of available seats in the car."
space_in_a_car = gets.chomp()
print "Number of drivers available."
drivers = gets.chomp()
print "Number of passagers that need transport."
passangers = gets.chomp

cars_not_driven = #{cars} - #{drivers}
cars_driven = drivers
carpool_capacity = #{cars_driven} * #{space_in_a_car}
average_passanger_per_car = #{passangers} / #{drivers}

print "The number of cars being driven today is #{cars_driven}.\n"
print "The number of cars not being driven today is #{cars_not_driven}.\n"
print "We have #{carpool_capacity} cars available.\n"
print "So we need to carry #{average_passanger_per_car} passangers per car to make sure we can transport everyone.\n"

代码将在不抛出任何错误的情况下运行，但这当然是因为我没有获得正确的命令：

cars_not_driven = #{cars} - #{drivers}
cars_driven = drivers
carpool_capacity = #{cars_driven} * #{space_in_a_car}
average_passanger_per_car = #{passangers} / #{drivers}

我在回报中得到的唯一价值是：

print "The number of cars being driven today is #{cars_driven}.\n"

我应该如何写作：

cars_not_driven = #{cars} - #{drivers} etc

---

要获取非驾驶的

汽车的数量

？

当您使用

获取时，Ruby需要并返回一个字符串。所以变量
car
，
drivers
等都是字符串

为了对它们执行整数运算，需要将它们转换为整数。在Ruby中，您可以使用
.to\i
来实现这一点

现在，有了这些信息，请尝试：

cars_not_driven = cars.to_i - drivers.to_i
cars_driven = drivers.to_i
carpool_capacity = cars_driven * space_in_a_car.to_i
average_passanger_per_car = passangers.to_i / drivers.to_i

您可以使用
.class
检查变量的类别。在这里：

cars = gets.chomp()
10
# => "10"
cars.class
# => String

drivers = gets.chomp()
20
# => "20"
drivers.class
# => String

现在让我们添加它们：

cars + drivers
# => "1020"

由于它们是字符串，
+
操作符将两个字符串添加到一个字符串中。不是你想要的。现在试试这个：

cars.to_i + drivers.to_i
# => 30

我不太明白你为什么使用这个
{var}
和

。如果我认为您希望使用纯ruby是正确的，那么这应该是解决方案：

print "Number of cars available today." 
cars = gets.chomp().to_i
print "Number of available seats in the car."
space_in_a_car = gets.chomp().to_i
print "Number of drivers available."
drivers = gets.chomp().to_i
print "Number of passagers that need transport."
passangers = gets.chomp.to_i

cars_not_driven = cars - drivers
cars_driven = drivers
carpool_capacity = cars_driven * space_in_a_car
average_passanger_per_car = passangers / drivers

print "The number of cars being driven today is #{cars_driven}.\n"
print "The number of cars not being driven today is #{cars_not_driven}.\n"
print "We have #{carpool_capacity} cars available.\n"
print "So we need to carry #{average_passanger_per_car} passangers per car to make sure we can transport everyone.\n"

请注意，在字符串文本之外，
#
开始一条注释。

是由其他用户的编辑引入的，我已经删除了它们。